Cancelling apple care when you bought your phone through trade in plan

Hi, I bought my IPhone 13 through a trade in/monthly plan and added a standard apple care until my case comes as I was told by a worker at the store that I can cancel whenever I want to through the subscriptions section in the settings however it’s not on there not sure if this is because it was purchased in store not on the app. Anyways, once my case is here, how do I go about cancelling it when it’s not possible through the subscriptions?