What threads are you referring to?
For posts that you have made, you can use the search function (
http://www.yorkietalk.com/forums/search.php) and find posts that you did.
Don't feel bad at all, you have plenty of time to learn everything. For the fancy avatars people use a graphics program to make an animated GIF. For photos, members can post them as attachments in posts or they can post photos in the YorkieTalk Photo Gallery as well (
http://www.yorkietalk.com/gallery).
Welcome to YorkieTalk!