YOu would need to use the root or loginuser password to login, and yes, typically this is set to something different than the Webadmin (or it should be, bad practice to use the same password for all 3 accounts).
YOu would need to use the root or loginuser password to login, and yes, typically this is set to something different than the Webadmin (or it should be, bad practice to use the same password for all 3 accounts).