I have a cable for my TV that was picked up by curbside back in May 2020. I never used it. Do I have to make an appointment to return it.

No appointments needed. Just go to costumer servis to receive store credit unless you have your receipt.

Yes

They typically have a 30 day limit for returns. If you still have the receipt, you can certainly try. No appointment necessary.

Unfortunately you wont be able to return it for a refund but you can return it for store credit and you do not need to make an appointment.