How to Record Guitar with Audacity using a backing track

I am often asked how I record lead guitar with a backing track.
If you have done it before it is simple, but if you don't know, this may help.
Audacity is freeware and available for download from the internet.
Please excuse the video and sound quality which is not the best.
A number of people have asked about my connections.
My guitar is connected to my effects pedal,
which is then connected directly to the Line-in socket on my PC.
If Audacity isn't recording your input, go to Edit/Preferences in Audacity. Click on devices. Make sure the Recording device selected is the connection you have connected your guitar to. This should allow Audacity to pick up your input.
If Audacity doesn't play the backing track whilst recording a new track, go to Edit/Preferences and from the menu select Recording. Make sure the Overdub check box is checked. This will allow previous tracks to play whilst recording a new one.