From Creatures Wikia
What the buttons/displays do (labelled in the image):
-- Displays room types. -- Cycle through with the arrows labled "I".
-- Toggles display of "room" boundries.
-- Information displays are talking about the room this button is in. -- You can detach the button by clicking on it so you can move it around.
-- Displays the current room type.
-- Press this button to apply any changes you've made to the room.
-- Lets you cycle through G.
-- Which "smell" H reflects and what you're changing with J. -- You can only change one smell at a time.
-- Displays the current level of G in the room.
-- Lets you cycle through A.
-- The amount of G "smell" you're going to add to the room. -- Change this number using the K arrows.
-- Changes J value (the amount of G you're going to add).
-- Sets H value (Current amount of G in room) to 0.