Open the Editor by tapping the pencil in song view, then tap Edit.
There are two ways to enter or change a chord:
- Tap the measure and type the chord on the keyboard.
- Tap the letter name of the chord, then either type the rest of it, or tap the ... button to the right of the chord entry box, swipe, and tap the chord quality you want.
To swap one quality for another, tap ... again and pick the new one. It replaces the old.
For the full guide, see Edit a song on the iReal Pro website.