Learn how to make maps together
If you added a background image to the map in the "resource" tab you can change the opacity of the tile and move the background.
With a premium account you can save your maps on the server and use them anywhere. This is still in beta and you might loose all of you data without warning. Make save on your computer to be safe.
Share your map online (be careful, nothing is secret once you shared it):
Connect to your account first.