In what file are enlisted to users?

[Jess Tafo11a]

Hello friends my name´s Jesus 
I have a problem, I am using freeradius on my virual machine to the ubuntu version 9.10 and want to add clients for my freeradius detect the mac address that I enter. The question is:
Is there any easy way to add clients?
Yo I have installed:
The virtualbox version 3.2.10
Ubuntu version 9.10
Freeradius version 1.2.1910
 		 	   		  
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