The list of materials:
2 220ohm resistors
Step 1: Preparing the Circuit
Step 2: Connecting to the Board
Step 3: Programming the Board
Notice that you'll need the Make Controller firmware source code, downloadable from http://www.makingthings.com/makecontrollerkit/software/index.htm. You may also want to have a C editor. For the MAKE Controller source code I really recommend you CrossStudio (http://www.rowley.co.uk/arm/) because it includes the source editor, a compiler, and the project manager. There's an alternative instead: using GNU ARM compiler together with cygwin. Read the make controller tutorials to get more information about these topics ;-)
Step 4: Upload the Firmware and Test!
And... that's all. You could improve it a lot, for example make the first line green and the second red, or make a character display, showing a message.
If you have found any mistake, please let me know so I can correct it. I'm also open to suggestions ;-)