I believe when you start Blockland for the first time it asks for keyboard layout. Selecting laptop (or whatever it is without numpad) places them at i/j/k/l for up/left/down/right, u/o for rotating left/right, p/; for up/down one brick and ,/. for up/down one plate. / is used to clear your ghost brick. I've been using my laptop over break as I didn't want to ship my PC home from college and its worked pretty well.