password autofill

This is a dumb question, but I just reformatted my mac and can't remember what I did previously. How do I get Safari to autofill my username and password to some sites? I remember after logging in my info a window would pop up and say "Remember info?" or whatever, but now I can't get it to do that. Thanks.

Turn Keychain on.

Open Preferences in Safari and go to the Auto Fill Tab.

Thanks dtravis.