You can edit a stroke on Shot-by-shot mode by tapping the 'Stroke pin' and dragging it along the map. Tap 'Save' when you are done.
To delete a stroke, tap the 'Stroke pin' and then the 'Trash bin' icon on the top bar.
To change a club, enter a penalty or add more information (fairway, missed long, sand short,...) you just need to tap the club name on the top bar. Two columns will appear, scroll on both to select the different options. Tap 'Save' to keep the changes.