1.Restart VLC to load the newly added plugin
2.Go into advanced preferences: Tools -> Preferences -> Show settings -> All
3.Enable/Disable the plugin with a checkbox: (in advanced preferences) Video -> Filters -> Pause/Play video on mouse click
4.Enable/Disable the plugin with a checkbox: (in advanced preferences) Interface -> Control Interfaces -> Pause/Play video on mouse click
5.Change mouse button to the one you want: (in advanced preferences) Video -> Filters -> Pause click -> Mouse Button
6.Restart VLC for settings to take place
7.Play a video
8.Click on video picture to pause/play the video