- 'bruksanvisning' (use guide) if it's an appliance.
- 'spilleregler' (game rules) if it's a game.
- 'monteringanvisning' (assembly guide) if it's something requiring assembly.
- 'instruks' if it's a set of actions to be performed in a given situation, 'branninstruks' = 'fire instructions'.
- 'instruksjon' would be 'guidance' or 'training'.
So there isn't one word, but many :)