How to install altiris agent on MAC

We have some  new MAC 10.8.5 machines, but somehow I can see them through my console, I have to manually install on each machine, I did the first mac machine it work, but how can I let my altiris server discover thoses remaing mac machines out there.

I know each mac's computer name, I can ping those mac machines, but I can not see from the console doing the installation.

Thanks

Lillian