Find UltraVNC Viewer
There's an icon on the desktop:
In the pop-up window, type: CL1354-INST
Then press Enter.
Type the password your instructor gives you and press enter.
Place the window as desired. (You might want to maximize it on the right hand monitor so you can still see your desktop icons. Before you maximize it, you can also try removing the menu bar at the top... experiment a bit to figure out how it works!)
If you prefer using the start menu, search for UltraVNC or scroll down to find UltraVNC > UltraVNC Viewer
If you can't connect...
...check to see if the instructor is logged in, and ask if they have started UltraVNC Server.