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What do stairs do? They take you from where you were, to somewhere else. They're a way to get from place to place.
Picture yourself climbing stairs, picture going from room to room. From place to place. From wherever you were to wherever you want to be.
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の, なんじ, すなわ
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If you're going from place to place, make sure you have some nori (の) seaweed on you, in case you get hungry. Nori is a great source of energy.
Imagine yourself going from one place to another with your pockets stuffed full of nori. The smell is starting to get overwhelming. It's making you really hungry (or nauseous, depending on how you feel about nori!).