The tutorial only mentions CTRL-SHIFT-R to start recording, but nothing about pausing them. Is the red button the only option? This would be useful if you are recording video playing in the whole screen.
Are you recording with Screen Recorder Pro? You can set the shortcut to pause and finish recording by yourself. Just go to “Settings” > “Options” > “General”, there you can enable keyboard shortcuts, and you can set short keys for screenshot, start recording, stop recording, pause/ resume recording and so on.