This should sum things up.
Here are 3 different ways to get to the Mission Editor (Only one needs to be done)
1. Changing the extension
• Right-Click Blockland, and create a shortcut
• Right-Click the shortcut, and select 'Properties'
• Find it's extenstion and add " -mod editor" to it
• Open Blockland using the modified shortcut
• Start a single player game, and hit F11 in game
2. Using a batch file
• Download Modeditor.bat
here.
• Put into C:\Blockland or C:\Program Files\Blockland, depending on OS
• Run Modeditor.bat
• Click Start a Game
• Select Single Player
• Start the game
• After load, press F11
3. Using the Client Side Version
• Go
here and download the file
• Save the file in the Add-Ons folder in the Blockland folder
• Start Blockland
• Make sure the new Add-On is turned on, then start a single player game
• Press F11 in game
Hopefully this helps you.