Hi Ricardo,
as far as I'm aware, the ConferenceMe application only exists for Windows, and is not really intended for being used for connecting to MCU conferences from public locations as it has no firewall traversal capabilites.
For connecting to MCU conferences from public locations, the best way would be to use the Jabber Video (Formerly called Movi) software client in combination with a VCS Expressway. Jabber Video works on both Windows and Mac.
Regards
Andreas