Article: Set means "place or put" and is a transitive verb, meaning it needs a subject and an object (i.e. subject + “set” + object). Ex. “He set the book on the table.”  Set also means “become stiff or gelatinous” and, in this form, is an intransitive verb that needs only a subject. Ex. “We need to let the concrete set before we let anyone walk on it.” Sit means "take a seat" and is an intransitive verb that only needs a subject. Ex. “Can you get the dog to sit?”  Sit also means "make someone take a seat" (often figuratively) and, in this form, is a transitive verb that needs a subject and an object. Ex. “Should we sit him down and talk to him about this?”
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Use “set” as instructed. Use "sit” as instructed.