Thread:RubensTUI/@comment-920954-20170610030625/@comment-920954-20170611063619

You have two ways to access the source editor, one is by manually selecting it and the other is setting it by default on your preferences menu. I'd recommend you the latter as doing the whole selection process for the first one may get tedious. So go to your preferences menu, select the edition tag and look for the prefered editor option, there you simply select "source editor" and click save at the bottom.