First check that you are entering the correct username and password. If they are okay then it is probably because your account needs activating. We require all new registrations be activated before you can log on. You were sent an email which contains instructions to follow; if you did not receive the email then check that your email address is valid. One reason activation is used is to reduce the possibility of rogue users abusing the board anonymously. If you are sure the email address you used is valid then try contacting the board administrator.