When you're in the Play & Practice area, you’ll first want to inject one of the available chord arrangements so you have some backing for the tune you’re working on.
You can quickly jump to the chord arrangements by clicking “below 👇”.

From here, you can add any arrangement to your tune by clicking the big purple Inject Chords button.

You’ll then see the chords being scribbled down onto the sheet music.
Once the chords have been added, you can make use of all 3 toggle buttons depending on how and what you’d like to practice.

Try it now with Hundred Pipers

Adam