Dear elavram,
even though organic maps is a really nice app for navigating I believe it isn't the best choice for adding information to the map. The main reason is simple: You only get updates once a month (maybe even at longer timeframes). So the information in your app may not be what's in the database.

There are other apps you might consider if you have the possibility of using mobile data: every door, osm go!, vespucci are just three that come to mind.

If you have any questions, don't hesitate to ask :)

here are also some chat groups that are always happy to help:
https://wiki.openstreetmap.org/wiki/Contact_channels#Chats.2Fmessengers

safe travels
silversurfer83