Time to time people will ask "How do you ____on the computer?" I'm lucky enough to have a program installed on my laptop that allows me to make a video with desktop view. ( example above)
Guess what? Today I found a program that will allow you to do the same! There is nothing to download! Screencast-O-Matic Just register for an account and start recording! Your video can be shared to youtube!
You get a 15 min max on time for your videos. Unless you really have something to teach I never recommend videos being over 3 min. People have short attention spans! I could tell you so much more about Screencast o matic but its not difficult just go check it out!