The one that shows up in your posts is called your avatar. Under your profile or settings, it should have a space where you can choose your avatar. This is different from your profile picture. It took me a while to figure out things here, so just keep exploring and don't be afraid to ask questions!
You aren't far! We got our guy in CA and I don't think he will get much bigger, which I am happy about. We love Frank, he is our baby and spoiled! I can't wait to see more pictures of Cooper...he and Gracie are super cute. That is one thing about this site...we loooove pictures and videos of bullies!