Changing User Permissions

Changing User Permissions

Hi, 

I was looking through Zoho Projects and I was attempting to change the permissions as per this link:

https://www.zoho.com/projects/project-access-privileges.html

Unfortunately (I am the overall owner) I cannot change the settings to match what I am seeing in this link.  Could someone advise where I would be able to do that?? Currently with the 4 available fields (Admin, Employee, Contractor & Manager) we aren't able to quite handle our requirements the way we should.  Thanks so much for your time.