I’m seeing this post so late, probably you already found a way to add this info, but just in case… For me the easiest a way to contribute is just using iD editor in the browser, you just go to OSM, create an account, zoom on the area you want to contribute and then click edit. This editor has everything you need and is easy to use but it may be a bit daunting the first time. If you are very new to this just check how other users gave tags to the near buildings created.
For the apps, I only use them to contribute very small things like adding a missing restaurant, I’m not sure that you can even use them to draw buildings and name streets.
As a more advanced editor you have JOSM, but since you seem new and looking the easiest way, the iD is just fine.




I feel you on that hahah
If it’s just an unnamed street then it is extremely easy, just click the road and put it a name. Then in the buildings, just click them and you’ll see that you can fill the address, the number, zip code and whatever else you want to add.
But be careful, this shit is extremely addictive. First you just want to map your street, then when you’re happy about it you go with your city block, then you go with the whole town and then you’re screwed trying to map your whole country!