You can fix locations (waypoints/client position pairs) that were created with the previous button. In reality, this function is not very useful. It is usefull to change the name or position of a client, but to change the coordinated is difficult. It is better to export all your waypoints and use a program like Google earth to adjust the coordinates. Also you can export your locations to a CSV file and use an editor to adjust names and positions on a big scale. If any locations is changed, the recorded visits will not be affected.
Google earth can be installed on your computer. For this application it is usefull in two aspects. The first is that we can export our waypoints(location) and then plot them with Google Earth. We can then adjust the waypoints and export them to a file. The application can then import it again. From Google Earth, you should save your waypoints in .KML format. The second is that we can display our tracks.