Linksys can't connect to Internet?

Why is this?

Everything is fine, the router has all of the lights on, and the router is recognized and everything.

The only thing that is missing is the internet. It says it can't connect to the internet.


What is the problem?

It is a Wireless-G Broadband router

Model: WRT54G

I have DSL from AT&T/Yahoo

Please help!
 
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