If you're looking to provide existing users with additional access to your fambam control center, you can do so by designating another user as an administrator of your fambam.
To designate another user as an admin, simply navigate to their account in your control center:
Then, tap the three-dot menu item in the upper right-hand corner of the account: ○○○
From this page, you can select "Edit Member"
And, then adjust their account type to "Admin"