If you need to add extra strokes, edit shots/putts or add a penalty after you finish a hole, it's easy to do so from the shot list. Tap on the score box:

Tap on the icon with three vertical dots on the right side of the shot you want to edit. From the menu you can set club/position/lie, move the shot up or down, delete it or move to another hole. 

TIP: you can also tap on the club name to set or change club and lie type, or tap on position icon to set or edit shot position, without going through the menu.

To add a stroke, use the plus icon at the bottom:

Change shot order by holding the two horizontal lines in the left and moving the stroke up or down.

Need to change sand or fairway state for the hole? See this article for instructions.