If you are the creator of the place, you have the option to edit or delete it. Go to the listing at foursquare.com, log in to your account, and click "Edit Venue” under the map. From there, click 'Edit Venue Details' which will allow you to change the name, address, map pin and more.
If you did not create the place, head over to the listing on the computer and click 'Report a Problem' below the map. Let us know how the necessary changes and one of our superusers will get to the edit as soon as possible!
If you are on iOS, tap through to the place page and scroll all the way down. Tap, 'Flag' and tell us a bit more about the issue.
If you are on Android, tap through to the place page and scroll all the way down. Tap, 'Report an Issue' and provide us with a bit more info on how to adjust the location.