Hi there,
feel free to ask any questions about level editor in this thread. Also - if there's anything that's not working please tell me about that.
The general HowTo is to just run the game, get into Level Editor category and do your stuff. :) Hopefully, without any problems.
Oh, the one important thing - there's no local copy support - after you save it goes straight to the workshop. You can set visibility to private until you're really done with the level, but yes, to save you have to upload it to t...