Near the top of the page you'll see "User CP", click on that.
To give yourself a signature to appear at the end of every post you make click on "Edit Profile" and one of the options you'll see is a signature box where you can enter text and pictures. In Edit Profile you can also customise the text that appears under your User Name as well - It's called "Custom User Text".
To add an Avatar (the small picture under your user name) go to "Edit Options" (next to Edit Profile) in your User CP, right by the bottom of the page, you'll see the option to 'Change Avatar', click the button and then you can pop in a custom one of your own, or there is a ready made selection you can choose from.
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