I hope you're having a good day so far. I hate to see you go, but I want to be sure I address your concern.
Canceling a QuickBooks Self-Employed subscription depends on where you purchased the product. Here's an article that will guide you through unsubscribing QBSE: Cancel your QuickBooks Self-Employed subscription.
Please don't hesitate to go back to this thread if you need any additional assistance. Take good care always.