Please watch the following video and look at the screenshots below for clarification.
1) Once you have Screencast-o-MaticĀ open, you may need to re-size the screencasting window.
2) Start recording by clicking the red button at the bottom.
3) If you need to pause to gather your thoughts, click the pause button under the window.
4) When you’re finished, click the ‘Done’ button.
5) Choose ‘Publish to Video File’.
6) Then ‘Save Video’.