The Information tab gives the latitude and longitude of the marker location, as well as any contact information you supply.
At the top of the list is the latitude and longitude of the marker location. Click the link to display the standard location pop-up menu.
Below the latitude and longitude coordinates, information about contacts at the marker location is shown. Click the Edit button to open the contact editor pop-up, where you can enter or change these values. Click the Save or Cancel buttons to save or discard your edits.