Basically on Windows you need a driver for the serial port - but once that is installed, a port should appear just like with a normal Espruino board.
But yeah, if that doesn't work, start a new thread - when we get it sorted the answer might help someone else (although if you can think of any additions to the Micro:bit page they'd really be appreciated!).
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
No problem... What OS are you using? I updated the docs recently: http://www.espruino.com/MicroBit
Basically on Windows you need a driver for the serial port - but once that is installed, a port should appear just like with a normal Espruino board.
But yeah, if that doesn't work, start a new thread - when we get it sorted the answer might help someone else (although if you can think of any additions to the Micro:bit page they'd really be appreciated!).