Adding a Signature or Avatar couldnt be more easy. Once you have found the picture/text you would like to use just go to.
1. Click profile at the top of the page.
2.Click modify profile.
3. If its a picture your wanting to add just paste the IMG code into the sig box. If your wanting to do an Avatar paste the url for the image your wanting to use.For text just type your text in. Text is only avalible on Sigs.
4. Once this is done just scroll to the bottom and click save