To mark a shot as a lost ball follow these instructions:
1) Select the shot by tapping on the shot label.
2) Select the more options (three dots at the bottom right if the screen) and tap where it’s says, ‘Lost Ball’ at the bottom of the page and tap "Confirm"
3) Tap and hold the Lost shot label and move this to the location of the lost ball. Release once done.
Your Lost ball has now been added. This will automatically add a stroke and distance penalty.