when your at the stairway click on the bottom right ballthingy. and insert a tile into each slot. You need to make sure they are lined up so the head can go across following the lines. then get the chair and pull it back down.
I know its pathetic but what do you do at the second room/level. With the computer and the floppy disk box. I was trying to use it on the disk drive but it wont do anything.