Step1: Download Screen Recorder and Set It Correctly
Before we get started,let’s download a screen recorder first.I will take Total Screen Recorder as example.I will show you how to record things you want.
Setting must be done correctly.(Detailed setting of total screen recorder can be found in this site).Here we need to fix a recording area.

Interface of Total Screen Recorder.
Red button is the starting menu.

We need to decide the region to capture.if you want to record the whole screen,click full screen;if fixed screen,fix your area.
Step 2: Let’s Get Started to Record
After finishing all the settings,click the start button.Then a green frame will appear,which is the area needed to be recorded.Since you have started,do whatever you want,they will be recorded.If you have finished your recording,stop it,save the file and watch the play back.It’s easy and convenient.
Free dowmload here:
http://www.totalscreenrecorder.com/download.html