The Source Feature Allows you create a Blank Page with no content, styling or whatsoever, It gives you the Freedom to input raw HTML Codes or any other Codes you have and it will take full effect in that Page. This gives experienced Coder to add features and styling that may not be in Mobimatic into a Page on their Mobile.
To get Started , Click under Pages. Then the this shows (Image Below)
Here You can easily Paste in your Codes and they will take effect on the App Previewer
Walk through Video
Knowing more about this interesting feature has been made easier through the this video which can be watched HERE