The H4 requires manual tagging to record your shots.
If you forget to do this before your shot then there are a few options.
1- If you remember to tag your H4 just after you have taken your shot, then as long as you are in the same area as your ball was you can tag your H4 at that point. The device will then register a shot as being taken from that location.
2- If you remember later on you missed that shot then you will need to manually add that shot in post round editing.