@shante:     Both computers need to be in the same network;  this means the Cat (aethernet) cables are plugged into the same router (or network switch).  If the router/modem your internet service provided doesn't have an available aethernet (Cat cable) port, you can connect the computers to an unmanaged network switch (they're not expensive), then connect the switch to the router.

Along with the P12 installer, you should also have a Queue Manager installer.  If the master computer is Mac and the slave is Windows (or vice versa), you'll need to download the Queue installer for the slave's OS.  Run the Queue Manager installer -not the Poser installer- on the second (slave) machine, the one which you intend to use for rendering.

  The first time you launch Queue, your firewall will challenge you for permission for Queue;  be sure to allow it.  The first time you send a render job from your master machine (the one with Poser installed) to the slave/rendercow/remote, the slave's firewall will challenge you for permission for FFRender64;  be sure to allow it.  You can install Queue on as many computers as you want.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5