If you need help registering, setting up your account, and getting started here, Naomi has made two wonderful video tutorials to walk you through all that:
Registering and Setting up your UserCP (User Control Panel)
Posts, Threads, Subscriptions, Etc
Registering and Setting up your UserCP (User Control Panel)
Posts, Threads, Subscriptions, Etc
Phyllis in Ukraine, with Jaan (AO grad), Raia (AO grad), Asya (age 17), Bogdan (age 13)