When you sign up to Rebrandly by clicking Continue with Google, your account doesn't have a separate Rebrandly password. But you can create one and remove the Rebrandly connection from your Google account settings.
To create a Rebrandly password
Go to the Rebrandly Forgot Password page.
Enter the email address associated with your Rebrandly account and click Reset password.
Check your email inbox for a password reset email from Rebrandly and click Reset your password.
Enter your new password and click Set password.
You can now log in to Rebrandly using your email and the password you just created.
To remove Rebrandly from Google Sign-in
These instructions are also available in the Google Help Center.
While signed in to Google, go to the Google Security page.
Scroll down to the Your linked apps section and click See all linked apps.
Find and click Rebrandly in the list of linked apps.
Click See details.
Click Stop using Sign in with Google.