Make sure you are clicking on the map to change it in the location tool under App Options.
Are you using the event tool?
You must use the location tool to edit that location's pin. The location's pin is displayed in the event tool so that you can see what location you are adding to your event.
If the location you've selected has the correct name but the pin is in the wrong place, you can add that location to that event, save that event, and edit the location of that pin afterward.
You can edit the location by going to the event tool, and clicking on the blue eye icon on that event.
Are you trying to drag the pin?
Trying clicking on the spot where you want the pin. On Google Maps you have to drag the street view pin, but you only need to click to move the location's pin in the