Let's perform some steps so you can successfully cancel your subscription, @accounting213.
It could be the browser is full of frequently-accessed pages which can cause display issues on the websites, like QBO. This might be the reason why you're seeing a blank screen when you click the Cancel subscription link.
To help fix this, you'll have to log in to your QBO account via a private browser. This helps isolate the issue since it doesn't store data in the cache. Please follow the keyboard shortcuts: