RADIUS Server Dialog Box

From the server console, click Configuration > Authentication > Password > RADIUS.
Select Use RADIUS authentication.
Click Add or Edit.

The options are:

Server	The name or IP address of the RADIUS authentication server.
Port	The port used for RADIUS requests.
Secret	The shared secret required to authenticate to the RADIUS server. NOTE:This secret is stored as plain text in the configuration file. Protection for this file is provided via Windows Access Control Lists.