on the one i have, to pair it you need to just attempt to pair it after it opens.
The sequence is something like:
- open keyboard, and the green light starts flashing.
- Go to the connections manager and attempt to pair The n800
- the connection manager will auto-generate a pin code
- select pair on the n800
- type the numerical code in on the keyboard (use the blue FN key for numbers), and press enter
It should be paired now and the green lights flashing should change.