If you add a place in Maps, the place is sent for approval and will be stored in public database. If you want to remove or modify the place, you need to submit a request via the Report command in your phone:
- In Maps, go to the place that needs to be deleted or modified.
- Tap to enter the place details view.
- Select Report.
- Describe what's wrong with the place and submit your report.
If a newly added place is not yet visible in Maps, wait until it's approved and appears in the Maps view.