How do you use the editor?
Well, here's what you do.
1.Make a shortcut of Blockland.exe
2.On that shortcut that you just made for your Blockland.exe, right click and select properties
3.On the image you see infront of you change it to look like this

4.Afther that, click apply then ok.Then start Blocklandland
using the shortcut you just made5.Go to start a game, pick a map you want to edit, then when your character loads on that map press F8 so you can be in fly mode (it will be usefull when your editing a map.) Then, press F11 and ta-da .Your in mission editor.
NOTE:If you want to learn how to make a good map yourself go to this link,
http://forum.blockland.us/index.php?topic=26277.0