keep your eggs warm and the humidity correct for 21 days (not really) click the set button when the temperature is low. click the glass of water when the humidity is low. if the game beeps it means you ether the temperature or the humidity is to low. to start click twelve times to fill up the incubator.
thanks to @Doodlebug450 for the egg sprites thanks to @AstarGalaxies for the nomadok icon