On geocaching.com, you can input solved or corrected co-ordinates on puzzles and multis by using the pencil (or edit) symbol to the right of the given co-ordinates on the page. The position on the map on your page will then change, and if you look at a general caching map of the area, a blue and white puzzle solved icon (which looks like a jigsaw piece) will appear on your screen only. You should be able to use the location to pin down the cache. You can also enter them on the Geocaching.com App using add solved co-ordinates or manage/add waypoints.
