Where to send the waitlist letter to?

I want to send a letter to express my interest, where should I send it to?
Should I send it to my admission adviser or the admission directer? How do you check who’s your admission adviser?

Thanks for answering.

I would send it directly to your admission advisor. You can call the admissions office and ask who the advisor for your area is. Sometimes beneficial to have your guidance counselor call. If anything has changed since you applied, received any awards, started a new job, anything positive, be sure to note that in your letter. Best of luck to you!