How do I start a new map?

I have been playing around with the editor and was wondering how to start my own map. When I click on Map at the top left the 'New' option cannot be clicked.

Any comments are appreciated.

Yes, this option is missing yet. Please wait a few days until the german technical documentation will be released (or try to translate the german one), there you can read what you have to do!

ok, thanks marcel!