On the main page, after you are logged in, the top menu link is "Edit My Profile". Click it and scroll down, you will find a box that says "Studio". If you are the member of an already existing studio, you can scroll throught the list and select it, if not, you have the option to click "New Studio" and make a name for your studio.
And read the faq that Ermac and AD made for making your video. Do you have a DVD rom or is it just a CD drive? You may need to purchase a DVD rom to get your footage.