Test out using Screencast-o-matic or QuickTime (Mac Users) with basic presentation

Test out using Screencast-o-matic or QuickTime (Mac Users) to create a simple but complete "how-to tutorial" on a topic of your choice. I'm trying to understand if this product will work for me but I want a new pair of eyes. Create something of your choice and use this tool. This will require speaking as well. I'd like it done by 9pm CST on Monday (10/17/16) so I could post it on my blog and get feedback.