(Firstly, moving it here where it fits better.)
Anyway, to answer your question, yes, you can change your profile. In fact, you can change it whenever you want and however many times you want to. All you have to do is go to the User Control Panel.
I'm not sure which theme you're using, but it should be a link (that says User Control Panel or possibly UCP) near the top of the page. It's probably going to be just under the banner, and either to the left or the right. It should also be near the text that says you have 0 new messages. (Or whatever number of messages.)
Hope this helps!