Be sure you are adding your user name and password exactly as you did when you joined. Your confirmation will have that information. Your username and password are case sensitive, and if you're cutting & pasting your log-in, please be careful not to add any spaces at the beginning or end of them.
If you have just joined the site for the first time and can't log in, it is possible that your join attempt was unsuccessful and you haven't in fact joined the site at all, you don't have an active membership.
Please contact us immediately (providing as much information as possible about your new membership), so that we can look into the problem and help you as quickly as we can. We reply personally to all emails within 24 hours.