you click the icon on your desktop to start the blockland editor
How was that supposed to help?
I have a tutorial, I've posted so many times, I wish people would search more.
Right click on the Blockland short-cut then this will pop up:

Click "Properties"
Then this should come up:

Then add " -mod editor" Without the " at the ending of the Target. should look like this:

Then click "Apply" then you're done.
Just go in-game then click "F10" or "F11" F11 is the mission editor and F10 is a gui Editor/Creator. Enjoy.
DO NOT RELEASE YOUR FIRST MAP