If you created your GoLogin account using Sign in with Google, you won't be able to use a login and password to enter the account simply because you don't have one.
Why change?
You might want to set up a login and password if you:
Need to change your GoLogin password without altering your Google account password
Want to update the email associated with your GoLogin account
Need to enable two-factor authentication for your GoLogin account
Find it more convenient
How to get your login and password:
Log out from your current account
At the login page, press the Forgot password button
Enter your Gmail that you have your account registered with
Get the recovery message from your email to set up you new password!
Note: You can still use Continue with Google if the email remains the same!