How to assign third party screenshot tool to Touch Bar.

Forgive my ignorance, I am hoping someone could inform me how to make screenshot button using the Shottr app for the Touch Bar.

Simple send the shortcut for the screenshot defined in Shottr.

Could break down how to find screenshot function defined in Shottr, example as simple as you can please.



Note: You may have to define your own keyboard shortcut in Shottr and then use it in BTT (in my example F18).


Thank you very much for taking this much time to help a stranger.