OK to answer some questions...
SSID is basically a broadcast saying "Hello! My Network Name is something!"
WEP - Wireless Encryption Protocol - dont use, its easilly hacked
WPA-PSK - Wi-Fi Protected Access with Pre-Shared Key
This is what you want, you edit your router to use this.
Type in a PSK, which is basically a password. Make sure its nice and long and its not just a word.
Then goto your PC and find the wireless network you named in your router...the SSID if its visible, click on it, then it will ask you to configure it. Set it to WPA-PSK and type in the PSK (password) That is all you need to do.
The WII has the same setup I would imagine.