How to disable Auto Extension of license?

I upgraded to "Ccleaner Professional" to give it a try. My computer now RUNS FAR WORSE than before I tried the pro tools and I never want to use them again. Under my "license key" tab it says it will auto extend my subscription. I refuse to allow this. How do I turn it off? and cancel my subscription? If I am charged, I will be reporting it as fraud to both my bank and the BBB (or equivalent if you aren't based in the US.)

I am not playing this game.

See here

https://support.piriform.com/hc/en-us/articles/360020674812-How-do-I-manage-my-CCleaner-subscription-#2-the-manage-subscription-link-in-the-ccleaner-app--0-2

Thank you, Hazelnut. I was on my last nerve, so your quick reply and direction are both appreciated.

Stay safe.