Trying to setup user based content filtering (user hits a login page
before they can browse, their credentials determines level of
filtering). Per
https://docs.fortinet.com/document/fortigate/6.0.0/cookbook/345944/creating-the-employee-user-and-polic...
Figured it out. I had to enable the "Multiple Security Profiles"
feature, under System > Feature Visibility on 6.0. Then I could change
my profiles.