To use CrossLoop is very simple all you will need to do is download and install the program from here: http://www.crossloop.com/ipage.htm?id=predownload. Also you will need to sign up for an account which is also free so no worries there.
When you open CrossLoop you will see a screen that looks similar to the image below. On this screen you will just need to login so that you will be at the main CrossLoop window.
CrossLoop logon screen
Once you have logged in you will now need to make sure that whoever has the computer that you would like to connect to has CrossLoop setup. Now to connect to them you will need them to click on the Share tab and then give you the code. Once you have the code they can they click Connect and so can you after you have entered their code into your CrossLoop. When you get connected to them they will get a notification asking if they would like to accept the connection.
Once they have accepted your connection you will then be able to control their screen from within a window on your computer. It will look something like the image below.
Connected in CrossLoop
Now that you have been successfully connected you can now fix their problem or just help them with something. CrossLoop can be very useful in many different ways so have fun with it. Now you can help others without even leaving your house.