How do you Change Theme Colors?

I’ve recently picked up the Pocono theme and am in the process of building my site around it.
I love the flexibility, but I’ve run into a bit of a wall with seeing that there’s no color/font adjustments in the theme customization panel.

Can somebody tell me how I can go about customizing it? Or is it a feature locked into buying the “pro” version of this theme?
It just seems like a very basic adjustment that almost any other theme I’ve worked with has included!