BTW, I received e-mail from Best Buy that my subscription would auto-renew on Jan.12, 2022. There were instructions to go to my profile page to cancel the auto-renewal. I went to my Best Buy profile page and clicked on "cancel subscription". Easy Peasy...
For anyone interested in trying Tidal, I highly suggest you go through the Best Buy discounted 1-year pre-paid subscription, especially when it is 50% off. The service is the same as if you purchased directly through Tidal and the cancellation was super easy.