Honey, there are so many different places to look for avatars. Here are a few:

http://pixies-place.com/lilith/avs/ (That's Lilith's site)
http://johnlund.com/paging2srch.asp?pagenum=1
http://www.geocities.com/hotsprings...7998/clouds.htm
http://www.fantasya.net/galerie.php...ction=1&ref=675
http://www.freeavatars.net/

Find the av you'd like to use, right click on it, and save it. Most of these you can use as is. However, my av was too big, so Lilith was good enough to shrink it for me.

Go to your control panel (user cp)
Click on 'edit options'
Click on 'change avatar'
If you want to use one of the supplied av's, just click on it.
Otherwise, you can upload the av you've chosen
Click on 'Browse' which will take you to your saved pictures
Locate the pic you want to use, and click on it
Click on 'yes' to use a custom av
Click on 'submit modifications'

I hope this helps, let me know if you get stuck.