If you are wishing to cancel you subscription, then follow the folling steps-
Log in to Course Hero and click on your profile picture icon located in the top-right corner. Select Account Settings and then click the Deactivate Account button. Once you click, you’ll see a pop-up window asking you to confirm that you'd like to deactivate. Once you confirm, you’ll be immediately logged out of Course Hero.
Or you can also contact Course Hero Customer Service, if you are facing any issue. They would help you at their best.