Hi andreamoro
The editor in maps.me has its limitations. I suspect you need to split the roads in question and you will need to use a "proper" editor for that.
If you have a desktop PC starting with the in browser editor iD would be a good idea (that's what you get when you click the "edit" button on openstreetmap.org).
Other current and full editors (I am specifically not pointing to the confusing list on our wiki here):
- JOSM (desktop, power tool) (http://josm.openstreetmap.de/) (http://josm.openstreetmap.de/ )
- P2 (desktop, browser/flash)
- Go Map!! (mobile, iOS, available from the App Store)
- Vespucci (mobile, android, power tool, available from google play) (http://vespucci.io/)
(http://vespucci.io/ )
Happy mapping!