Trying to configure Radius or AD VPN with Core

Story : After testing the VPN with two users, it’s time to expand for more.

In the manual, that can be found here :

On page 171, section 14.1.2 Authentication Methods:

There are details on how to authenticate with Radius or AD, but I just can’t find this section.
I refreshed the Remote User Accounts page, but nothing. Do we need to reboot?

Should I put this in the bugs section?

Any help would be apreciated. Thanks.