To install the VNC server on Backtrack here are the instructions: (There are also helpful photos of each step of installation)
1. Boot up Backtrack
2.Go to the BT bar and go to Internet > Network Manager: and connect to your network
3.Open up "Terminal"
4. Type in: "apt-get install tightvncserver" (without quotation marks) (WARNING: You may see some errors while it installs, you'll be OK! There is noting to worry about...)
5. Once it is done installing type in: "vncserver" and hit enter
6. You will now see a list of controls for the program! It installed successfully!