Check your user ID and password. Also make sure that you are logging in using the same method that you used to set up the account. For example, if you signed up with Google or Facebook, you will need to select the "Log In with Google" or "Log In with Facebook" options when you log back in.
If you still can't log in, you may need to change your password. Do this by clicking LOG IN, then click "Don't remember your password?" and then follow the instructions.
If you are still having problems, send us an email.