Garmin Communicator Plugin for Mac

I understand I have to use Garmin Communicator Plug in to do certain things with my Montana 750i, but cannot find it after installing it.  I am using Mac and Safari.  The instructions do not help me find it in Safari.  What do I have to use to find it and use it in Safari on Mac  Thank you in advance.

What I am trying to do is load vehicles from the Garmin site into my Garmin Montana 750i.  I understand I have to have Communicator Plug in to do this.  Is this correct?