If by chance, you forgot to track a shot or need to edit the details about a shot from your round but you have already finished the round, here is how you can go back and edit.
First, you need to select the round you want to edit from your Playing History
Once you have the round selected, you can choose to "View & Edit" the round.
Next, select the "Edit Scores" option
If you need to add a shot that you forgot to track, select the "+" button at the bottom of the shot list and you will see a menu like this where you can choose what kind of shot that you want to add
note: flag position can be edited here too and is used to improve the accuracy of some statistics
Once you have added the shot, select the three vertical dots next to it to display the shot details menu, this is also the button you would use to edit any shot details post round.
Here are more details about shot tracking (including pictures!)