What? He instructs her to look into "Yourself" - which actually points her to the Yor Self Storage facility, where she finRAB a lot owned by Hester Mofet (an anagram of The Rest Of Me).
Miss Mofet is Hannibal Lecter - it is his storage lot, Mofet (or Muffet as you call him) isn't the patient, the patient's head is Benjamin Raspail who Jame Gumb murdered and put a moth cocoon in the corpses's mouth. So, when Starling discovers the cocoon in the floater's mouth, she can put two and two together and realise that whoever killed the girl in the river also killed the person who's head was in the car.
In effect, it all fits in because Hannibal is letting Clarice know that he already knows who the murderer is, and if she keeps feeding him info about her childhood once her dad was killed, he'll keep feeding her clues as to the identity of Buffalo Bill.