I need my network key

Hello...if you have logged into your router, you can find your network key by going to Wireless > Security on the menu.
If using WPA encryption, your network key is on this page: it will be labelled Pre-Shared Key or PSK according to the manual I have. Hope this helps.

(For info: the network key may also be known as the passphrase, WPA shared key, WEP key, WPA-PSK, authentication key, or security key).