Login to your Gsuite Admin account using the URL: admin.google.com Username will be the email ID who have the Admin rights and the password for the same.
Go to Users.
Click on the Username for which you want to reset the password.
Click on Reset password.
Enter the new password. Turn on ‘Ask for a password change at the next sign-in’ if you want the user to change the password on their own when they first login or else you can turn it off.