you go to blueprints at the top corner of the screen, click on the room you want to add then click on the little green square to droop the blueprint. then you either use the left, right, up, or down arrow to guide your hero to the open door. then you go in to the door, then you will be in the next room. then you scroll down your screen to the little backpack, then if you go slightly to the left you will see some monsters and traps. then if you click on one of the the monsters and traps, you will see little green squares on the floor. you let go of the monsters and traps on the floor, voila! you have placed your first monster or trap. repeat until construction backpack is empty. then go raid some tombs to get gold, tokens, tresure, and more boxed monsters and traps.