Sorry to hear you're struggling to login.
If you have a normal shopping account and are struggling to login with your details, we'd recommend you try resetting your password in the first instance. As long as we have your correct details on file, you'll get an email enabling you to reset your password.
If you cannot reset your password - this may mean that the details on our records are not accurate (eg. email address not spelled correctly). During these circumstances you would need to register as a new user as we are unable to make changes to your online profile, including changing your email address.