You can record your computer screen with audio from your mic and share the recording file. Recordings can be uploaded to Canvas, Box.net or UTH-Share
How to record on a Windows machine:
Open up the program you want to record (Power Point, for example), and go into full screen mode (Presentation mode, on Power Point)
On your keyboard, press the Windows Button + G (both at the same time), to active the Game Menu.
On the top left of the screen, there is a dot that signifies recording, click it once (there will be a slight delay on the start of the recording)
A bar to the right of the screen will appear, showing the recording time, a stop button and a mic mute.
When you are finished with your recording, you can find your saved video files under the Videos>Capture folder on your windows machine. (You can also find this in the Game Menu by pressing the Windows Button + G, clicking "Show all captures" in the same space the recording button is located, and selecting "Open File Location" on gallery window that appears).
Try testing your recording ahead of time to ensure there are no loud noises or distractions around you while recording. The microphone is sensitive in this mode and will pick up ambient sounds around you.