somewhere on the left hand side of your account will be a little place the says invitations and gives you a box to type an email in. it tells you how many invites you have too. if it's not there it's simply because you haven't got any invites from google. I don't think their handing them out right now. wait a while and when google can support more people you might get some invites. keep in mind that their handed out randomly so you still mightent get any. i only got like 5.