Follow the instructions below to add a penalty:
1) Tap the '+' button at the bottom right of the screen.
2) A new box will appear with the option of 1 Penalty Stroke or 2 Penalty strokes at the top of the box. Tap on one of these. This will highlight in red. Tap "Continue" to proceed.
4) Tap on the screen where that Penalty shot should be. The Penalty stroke will be placed next to the shot and your score adjusted accordingly.