Places do not require an unlock to make the edit. As long as you have had the app running near the location, you should have edit rights.
All you need to do is make the changes you need and it will create a place update request for us to review. You can post in here when the place update request is ready for us to review.
If you have not been near the location in the last 3 months, you will not be able to edit anything. You can post the information here and we can get it updated for you.