How come my Apple TV isn't recognizing Home Sharing?

I just got a new Apple TV and I tried to set it up last night. I enabled home sharing on my computer and then used the same ID and password to enable it on the Apple TV, but it said there was an error (“couldn’t find my ID or wrong password”). It worked on my computer, so I’m pretty sure I’m using the right ID and password. It also wasn’t recognizing my wi-fi connection. I’m not quite sure how to troubleshoot this. (sad face) Suggestions?