First step for either one is to go to your User CP (4th item in the dark grey bar near the top of every Camaro5 page.
To get a pic to show up under your name, on the left side of the User CP, under the Settings & Options block the first entry should be "Edit Avatar" (if you can't find it, use
this link). Scroll down to the bottom of the page and you'll find a place for Custom Avatars. From there, you can either upload a picture from your computer or link to an image hosted elsewhere on the internet.
To get something other than the grey bar under your name, from the User CP, on the left side of the page go to "Edit User Details". Or ... just follow
this link. Custom User Title is the first line in the Option Information section (2nd block) of the Edit User Details page. Type in what you want, scroll down to the bottom & save changes.
If instead you meant that you want a list of items to show at the bottom of each post, you have to edit your signature. That one is right below Edit Avatar on the left side of your User CP (
here).