1) make sure the mission editor.zip is in the Blockland folder
2) make a shortcut of Blockland.exe (the actual icon you click to play the game) to your desktop
3) go to your desktop and right click the shortcut you made, and go to properties
4) go to the target textbox and put " -mod editor" right after what is in there, but without the quotes
5) what you entered in the target box should look like this, without the quotes:
"C:\Blockland\Blockland.exe -mod editor"
or if you have the BL folder in your program files:
"C:\Program Files\Blockland\Blockland.exe -mod editor"
still don't get it? this video was put together by Wedge:
Video--If you cannot understand this guide, the Mission Editor is not for you--
FAQ:
Q: Will this work with the demo version (can I install and use this with the demo?)?
A: No (Answered by Twix[NL])