Well, first off avatars can only be 100 pixels wide by 100 pixels tall and 29kb(killa bytes) big. now 100 by 100 pixels is this big:

.
So to make an avatar appear you need to enter a URL in the area circled or upload it to the forum database (where someone else could possibly use your avatar):
Now to some of you you might not know what a "URL" is. A URL is a internet address of some sort or is also known as a uniform resource indentifier.
To upload an avatar to the forum's database, go to "My account" and click "change avatar", but make sure it's still 29KB or under and is either 100 by 100 pixels or under. So go to "My Account" and click "change avatar" and then you'll get to a panel that looks like this:

.
Then click the "browse" button which is also circle or sqaured. After you have done all that jibber jabber when you've clicked the "browse button" this window:
Will appear and you'll be able to access your files from that window just Make sure the image is within the requirements because if it is over 100 by 100 pixels you will anger the weasel. So I think this has explained how to uppload your avatar If I missed anything or if you have any question I'll help asap.
Lou I hope you add the stickyness!
~kevin
Sorry about the pics I thought pitures would work better.