To access the Desktop GUI from your home pc via VNC, you will need a desktop VNC client like TightVNC (Windows) or ChickenoftheVNC (OS X).
The first VNC server you start (see "How to Setup Desktop/VNC Templates") will be running on port 5901 (abbreviated to 1), with any additional VNC desktops you start running on port 5902 (abbreviated to 2), etc.
To connect to the VNC, open your desktop VNC client and enter:
IP Address: the main IP of your VPS.
Port: 1 (use 5901 alternately)
Password: host2==