I've recently changed 2wire security from wpa-psk to wep(shared). But it completely removed all of my preset wireless settings. So now my router is incompatible, and will not connect to the Internet. Does anybody have any words of advice to help
Me fix this?

Reset it again with the correct settings.

Do I set it back to wpa, or just enter the settings and save them?

Also, how do I find the settings?

moved to RT

ask the person who set it up the first time.