I'm Theolyn, a member of the welcoming committee - I'm here to help you learn the ropes about the site! The reason why I'm leaving you this "visitor message" is the same reason why you can't send or receive regular PMs - you need to become a Citizen (make 25 posts and send the citizen application) to have this option.
I suggest you read the Membership Manual and the stickies - there's everything you need to know about the site. However, if you can't find something you want to know, reply to this message and I'll do my best to help you
According to site rules, you need to have a last name as well. You can choose to have the same last name as your family members here, or you can have another one. Everything you need to know is in the membership manual