i have installed the forum plgin but the admin section does not seem to work.

http://www.purolatino.com/foro/

i am unable to add new topics or login to the admin. also, when user is logged in and makes a post his info does not show. can someone help me out w/some tips on how to make it work. thanks

Try using the latest version of the plugin. It doesn't look like you are running 1.0rc1.

Then, here are some things you should know:
1) Only root users can access the forum administration.
2) Are you using a custom theme? This might affect what info is shown for each user next to their post. Does it work for you using the theme I include with the plugin?