Possible causes and solutions
If you forgot your password, use the Reset password function on the Login page (then check your Inbox/Spam for the reset password email).
If you are unable to log into your goalunited account, try the Basic Troubleshooting Steps first.
If it's been a long time since you logged in last time, your account may have been deleted due to inactivity. In this case, you will have to create a new account. Check the Account and Club Deletion article for more details.