I cant open my admin panel on TP-Link access point , how can I do so ?

Unplug it

Try to update the firmware.Here is the link TPLINK
Download for TL WA5210G V1

insert your 3G Card adapter to the USB port and thenuse your PC come to http://192.168.1.1 log in to the admin with name admin, password admin .
Open the operating status, it will show being identified, waiting about 20s it will done. else if it can't be recognized. You need to set the BIN file by you self, you can download the file from www.tp-link.com
Then set it step by step as it show

the first time you access http://192.168.0.50 it will ask you for username and password. Type the default username and password. If you don't know try one of these:

Username: admin
Password: password

Username: admin
Password: No password (just hit enter after you type the username)

Username: admin
Password: admin

Marko, there are several operation modes that your access point supports, make sure that you have selected the appropriate mode for your network. For example if you have several wireless devices connecting to the internet through this access point, select Multi-SSID. You can review the following manual and see which mode is relevant to your network.

http://www.tp-link.com/Resources/document/TL-WA701ND_V2_User_Guide.pdf

Follow this to reset your router:
http://www.tp-link.com/en/article/?id=82

Use the Factory Default Reset button: First, turn off the AP's power. Second, press and hold the default Reset button then turn on the AP's power, until the system LED lights up (about 3 seconds). Last, release the reset button and wait for the AP to reboot.


Reset the factory defaults.


Here is your user manual:
http://www.tp-link.com/english/soft/20091515618.pdf


Default username and password is admin for both

you can get the manuals of how to configure tp-link tl-wa730re..just go to google and type free tp-link tl-wa730re manuals.

The Issue you are having is that you might be typing in the wrong IP address for the Access Point.
Follow these Steps Below and this should fix your problem.

Step1:Open your web browser.
Step2:Type in IP address http://192.168.1.254 in the address field of web browser and press Enter.
Step3:Enter admin for the User Name and Password (both in lower case letters).
Step4:Then click OK or press Enter.

Go to This web Address to get a copy of the manual for your device in PDF Form.

http://www.tp-link.com/english/soft/TL-WA500G_User_Guide_201003.pdf

You need to access your router setup and admin pages.

At START, RUN, type in CMD. This will open DOS dialog box. at the >prompt, type ipconfig. Look at the data returned, Your are looking for the Default Gateway. It will be like 192.168.1.1 or some other sequence.

in your browser's address bar, enter this number. This opens the router set up/admin page. default login should be user:admin, password:admin.

I don't have the model number of your TP Link router. Find yours at TP Link. You need to change your Newwork name (SSID), your user name and your password. Change also your wireless security to WEP.
All of this should be in your manual or on line.

The picture below shows the WEP change.

Good Luck