I'll add an additional comment - if you are relatively new to editing maps, please refrain from editing until you've read the map editing forums.
I just dove into editing recently, I did read the "Read me first!" posts, but there's a lot of detail about map editing that I got wrong at first. After spending a bunch of time reading the forums (especially the threads discussing do's ant don'ts of editing), I've discovered that a lot of my early edits, while not dangerous, violated the current thinking about edits. It took me a long time to figure out why roads that I added were red in the editor and never showed up on client, for instance. I fully mapped all the lanes in a parking lot instead of just the main perimeter. I named the lanes in a parking lot to avoid the inappropriate "turn on XYZ street" messages, not understanding the adverse impact it would have. I created a parking lot landmark that I shouldn't have, and so on. The quickie tutorials tell you how to do a lot of things but don't tell you that unless you really know what you are doing, you shouldn't be doing most of the things they tell you how to do.
I know a lot more about editing than I did when I started, but I still think it's important to read up. I follow the discussions, because the thoughts on a lot of things are in flux, and the accepted wisdon changes over time. And if you aren't absolutely sure about something you want to do, ask about it, so someone else doesn't have to come in later to clean up your mess.