User1759999623 posted
That's the key; you are on a hosted site. You would need for the site administrator to grant you adminstrator rights. Not likely if you're not directly connected in some way with the hosted site. Furthermore, they probably would not allow
the use of "administrator", so your login would need to be granted the rights.
Bottom line: You are at the mercy of the site administrator. Besides the obvious security issues with using an administrator account in the first place, you might want to look at using a more limited user instead.