Type on the address bar - www.facebook.com/videocalling
Click GET STARTED button
The Chat box will open, select the friend you want to see through video chat
The chat box to your friend will appear, click the video button on upper right
A window will appear, click set up video calling
The Facebook video call plug-in will be downloaded, you have to save and then run the program.
Once finished, wait for the video chat window to appear and you will be able to see and talk at the same time to your friend.
Enjoy!