Help with Advanced Theme Editing

Hey Everyone quick question. Im still in the learning phases of advanced editing of wordpress. I have a theme that comes with out of the box pre loaded text. It does not require an .xml import file everything is built right in to the file and when the theme is activated everything is in place.

Here is the Theme https://www.inkthemes.com/previews/?demo_id=15

Here is my question…lets say I want to edit the preloaded text in the theme folder. Meaning can I edit the demo text within the theme itself not in the text editor so I can develop the theme to a niche business and develop it for my clients so when it preloads on the client end it has relevant text for that business. I guess what Im saying is where do I find the pre loaded demo data in this theme?

Im not looking to resell it just streamline my development for a nich business.

Cheers for all the help and support in advance.

Dshadow