Talk:X11

I have mac and i am having trouble connecting to the Latex program to do my lab. I loaded the program X11 from my OSX disk and when i open it the screen reads: bash-3.2$, and when i try and type in the code shown on the website: "xhost + ssh -XY jcg24@ComputerName.oit.duke.edu" it says that xhost is not a valid command. Did I miss a step and/or what do i need to do in order to contact the Latex clusters.