How to find file responsible for creating a certain block of text on front end?

I’ve installed a theme on my website and the theme developer isn’t being all that helpful. A specific text block is supposed to be editable through their settings menu in the backend but editing it there has no affect on the front end.

I haven’t done much hands on web page programming in probably 10+ years, and even then I wasn’t into it much. However, I am pretty good with some other programming languages and can find my way around.

How can I find the file responsible for the text below “News & Blog” on www.kratomhub.ca ? The Latin looking stock text you often see.