For house numbers see
https://wiki.openstreetmap.org/wiki/Key:addr:housenumber
You can add them to a building or a point. If a building has several entrances (separated by different house numbers) it makes sense to mark (and tag) an entrance (look that up in the wiki).
OpenStreetMap
Discussion
Comment from Rovastar on 14 March 2014 at 08:07
What problems do you have?
Comment from zarl on 14 March 2014 at 11:35
Please start commenting your edits. See https://wiki.openstreetmap.org/wiki/Good_changeset_comments
For house numbers see https://wiki.openstreetmap.org/wiki/Key:addr:housenumber You can add them to a building or a point. If a building has several entrances (separated by different house numbers) it makes sense to mark (and tag) an entrance (look that up in the wiki).
Comment from charliedarcy on 17 March 2014 at 06:10
What i meant to say was peoples helping me with house number editing lol