Zoho admin

I am extremely frustrated with the counter intuitive nature of the Admin functions here, but I bought the product so I am stuck with it. I recently let go of an employee and deactivated his account. I need to reactivate the account with a new user and give them a new company email, and reset the password; Zoho is not letting me do any of this. It makes no sense that the administrator can't change the functions of the accounts they administer. Now, online I am seeing a solution that requires me to log on as a "Super Administrator", which I didn't know was a permission I needed, or was available when I PAID FOR THE ACCOUNT!

Can someone please Tell me:

1) How to change the email, password and personal setting of an account I administer since I can't depend on the fired person to do it.

2) How to get this allusive super admin thing that I should have been told about when I bought the account.

3) Please tell me if there is also a super-duper-uber-secret-admin that I need to be aware of.