Logitech Harmony add activities

I’m sure this has been asked, but I can’t find it. Can someone point me towards directions to add a logitech harmony hub to Roomie, and then be able to access it via the app to turn on an activity?

I added the IP and the hub shows in my devices. Now I don’t know how to pick an activity from that hub and use it to turn on my TV. For example, I want to activate the “turn on the TV“ activity from my iPhone.

I am new, the app looks great in helpful, and I think I’m missing a simple button click that will make me very happy!

This information is on the Compatibility page:

Lots of other details are here on this forum.