How do you adjust power during Bike Indoor *during* the ride?

I'm using my Fenix 6 to control a Wahoo Kicke smart trainer. I select Bike Indoor, then Set Power, then Free Workout.

But after I warm up I want to adjust the power from 55w to higher and can figure out how to do that without stopping the activity.

Also, any idea if there's a way to program a custom workout?

Thanks