Can anyone help me? Css edit

Hi guys!

I need to edit the area with profile information labeled right under ‘submitted by’.

I want the user name and/or avatar to lead to the user profile, and this has to happen with all users that will be using the site.

I also want to add some CSS to the text to make it look nice, but I don’t know how to add the area to my style.css file. Can anyone help? Ie, It doesn’t seem to have an area in the style.css when I useFirebug on it.

Thanks guys