well for starters you could try right clicking your avi copy image location then post it just surrounded by the img code boxes
like this
then surround it by code like this
[img]http://avatar5.gaiaonline.com/gaia/members/ava/f2/d5/19ccd9e528d5f2_flip.png?t=1166996333_3.00_11[/img]
and sorry about the crappy streatch... i guess that's a good reason for tinyurling