Moogie did answer your second question, Jazeera doesn\'t have an avatar. Perhaps you are mixing up a signature image and an avatar, as an avatar is an image on the left directly under the player\'s name. Only special people have them.
Now, you are allowed a signature image of maximum 100 by 500 pixels. Cannot be rude or offensive, but I think that\'s about the only rule. To insert one:
1.) Go to proflie up at the top of the screen, go to edit signature.
From there, you can put in any text based signature, read the rules there.
2.) To post an image, you need to host it somewhere, like imageshack.com. When you have uploaded an image there, it will give you a screen with information on displaying it. Save this info.
3.) Back in edit signature, you put in the direct link to the image (from the imageshack page) with an img in brackets before the link, and /img in brackets after the link.
Preview it, the image should show up. You can also add text, and embedded links as well. To embed a link, within the img and /img, add url (in brackets again) followed by the link followed by /url (again in brackets) This must be done inside of the img and /img not disrupting the link of the picture.
Hope this helps,
Xirius