Where do I find the WPA key to set up wireless network?

You did not elaborate further why you cannot connect you PSP to internet. But I will assume that you have a wireless connection within reach and that your PSP Wi-Fi switch is turned on (switch on the right).
1.) If your wireless network requires a Network Key (WEP or WPA), you need to know the exact key to be able to connect to it. 2.) To connect to internet, open Internet Browser in your PSP and this will prompt you to connect to a Wireless network. 3.) To set-up, press the 'scroll right' button (>) until you reach the "Network Key". Choose the type of key your network is using (WEP, WPA or other) then press 'scroll right' (>) again until you reach the last menu. 4.) If you do not encounter any error, you can start browsing. If you still do, you may have to leave the specific errors or further details of your problem for us to assess...
P.S. My favorite is God of War (I hope you have tried playing it)...

Hi Friend, In this case UI would like to tell you that the WPA key is the same password that you use to connect to the Internet wirelessly from your system.
The WPA key is the password that you set for the wireless network at your home. So, I would recommend you to try and enter the wireless network name's password

If you are trying to connect the PSP through a network that belongs to you, then the network administrator is the person to ask for the WPA key.
The WPA is like a password. It protects the network from unauthorized access.

The wpa key is the wireless password for whatever wireless network your trying to connect to.
You cannot use these wireless networks that have wpa security unless you get the relevant key from the owner of the network

hi, to get the wpa shared key you need to contact your network service provider and ask them for this key as they do this to stop people hacking into your wireless devices.

You need to contact them and explain what you need it for then they will let you know what this key is as its not for a laptop or pc it works slightly different with a laptop or desktop computer you would use a memory stick to get the wpa key and then insert it into the laptop or desktop device to then programme it to the correct wpa key but as the psp is wireless in itself then you need to contact your service provider and ask them to provide you with the correct key.

Doing this will solve the problem your having.

Let me know how you got on or if you need further assistance ok

wpa key is a password or access key to a wireless network if you have the key the psp will scan for wireless network if your is listed select it and when prompted enter key

The WPA key is the router wireless password the wpa key can be found on the router page that can be accessed by the computer
so we need to click on start go to run and type cmd nd click ok in the black window type ipconfig and press enter note down the default gateway now open up a internet explorer and in the address bar that is the www bar type the default gateway ()ike 192.168.1.1) now if it asks you for a user name and password then try these combinations user- admin pass - admin
user- admin pass- password
user- admin pass- (blank)
the router page will open up now go to wireless then wireless security and you can find the key over there
note down the wpa key and close the page now enter it in your psp

Your wpa key is the key that you created to secure your wireless network. You are going to need this for any wireless device you try to use on your network because it is to stop unauthorized access. You will need to access your wireless router to find out the key if you do not have it written down. You should be able to do this using your computer. Most wireless routers will require you to connect to it with a network cable in order to access it to gain this info.

To connect to the internet;

1. Check that you have your PSP® (PlayStation® Portable) system set up for Wireless (WLAN) networking in Infrastructure Mode.
   
2. Make sure the WLAN switch on the left side of the PSP® is turned on so that the PSP® can connect to the internet.
3. Make sure you are within range of a wireless access point (or hotspot) that allows connections to the internet.
4. Select (WWW) under (Network) from the home menu and press .
5. Use the up and down buttons to select the address bar and press to display the on-screen keyboard.
6. Use the on-screen keyboard to enter the address for the web page you want to display.
   
7. When you have finished entering the address, highlight the Enter button and press .
8. Select a connection and press .
9. The web page will be displayed.
10. To hide the on-screen menu, press .

Setting up Infrastructure Mode;

Infrastructure Mode allows you to connect your PSP® (PlayStation® Portable) system to the internet through a wireless network (WLAN) access point.
Required items:

• A PSP® with system software version 2.0 or later.
• A wireless network(WLAN) access point with internet access, such as:
  • A Wi-Fi hotspot (such as those at cafés, hotels and airports).
  • A home wireless network, which might include:
    • A subscription to an Internet Service Provider (ISP)
    • A DSL or cable modem
    • A wireless broadband router
• Settings used for the SSID, WEP/WPA-PSK encryption and WEP/WPA-PSK key, as specified when the wireless access point was configured.
  

To set up Infrastructure Mode on your PSP®:

1. Make sure the WLAN switch on the left side of the PSP® is turned on so that the PSP® can connect to the internet.
2. Highlight (Settings) from the home menu.
3. Select (Network Settings) and press .
4. Select Infrastructure Mode and press .
5. Select New Connection and press .
6. Use the on-screen keyboard to enter a name for the connection, then press the right arrow button to continue.
   
7. To set the Service Set Identifier (SSID) for the access point, select one of the following:
   • Scan: searches for and then displays a list of access points (or wireless networks) and displays the SSIDs.
   • Enter Manually: allows the user to enter the SSID using the keyboard. Select this option if you know the SSID of the access point.
8. If you choose the Scan option in the previous step, select the access point to be used and press .
9. Confirm the SSID and press the right directional button.
10. To enter security information for the access point, choose one of the following:
    • None: does not set security information.
    • Wired Equivalent Privacy (WEP), WPA-PSK (TKIP), WPA-PSK (AES): all set security information. Press the right arrow button to move to the screen for entering WEP or WPA (Wi-Fi Protected Access) keys. Note: The WEP and WPA key fields display eight asterisks no matter how many characters you enter as the key.
      
11. After entering the security information, press the right arrow button to continue.
12. To select the address setting method, choose one of the following:
    • Easy: the following information is automatically set
      • IP address settings: Automatic
      • DNS settings: Automatic
      • Proxy server: Do Not Use
      • Internet browser: Do Not Start
      Note: Most home networks will allow you to use the Easy address setting, which is recommended.
      
    • Custom: you can manually enter detailed setting information, such as when you are using a static IP network. For details, see the instructions supplied with the network device or the information provided by your ISP.
13. After selecting the address setting method, press the right arrow button to continue.
14. Check the settings, using the left arrow button to return to previous screens to make any necessary corrections.
15. To save the new connection, press .
16. To test the connection, select Test Connection and press .
17. If the connection is successful, information about the network connection will appear. Press to end the connection test.

You can also check http://www.us.playstation.com/support/psp
for more information.

This is the password to your wireless network.