You can directly edit at Openstreetmap.org with the Id editor.
- Open your Internet browser, and go to the OpenStreetMap website at http://www.openstreetmap.org.
- Login using your OpenStreetMap account
- Pan and zoom the map to the area that you wish to edit. You can pan by holding the left mouse button and dragging the map to your desired area
- Click on the small arrow next to Edit. Then click Edit with iD (in-browser editor).