To post your picture, you need to go to your Profile page from the commands at the top of the OBC Connect page. There, you will see another set of commands along the top that you can select. One of them is called "Avatar". That's what you need. There's a command line there that says "Upload avatar from my computer" or something like that. This will allow you to browse your computer's directory and select the picture you want.
That should do the trick. Let us know if you still need a hand. So many folks here are happy to help in so many different ways.