I sent an email (I posted it below). Angela got back to me within minutes saying thank you and that my intention to stay on the waitlist is in my file now and there's no need to send the cut-off paper in. Hope that helps!
Dear Factor-Inentash Faculty of Social Work,This email is to confirm that I, Alysha Bernstein-Sidenberg, wish to remain on the waitlist for the 2-year MSW this year. I will also be mailing in the cutoff sheet at the bottom of my waitlist letter but I thought I would take the opportunity to email as well. Thank you so much for your continued consideration of my application. Although it is not likely, I hope to hear from you in the next few months.All the best on this rainy Wednesday.Alysha Danielle Bernstein-Sidenberg