Breaking up is hard to do, we know, but in this case, pretty easy!
Before you cancel, make sure you export any data/reports you want to keep, you won’t be able to after your account expires.
1. Log into your Whitespark account - https://accounts.whitespark.ca/sign-in
2. Click Manage beside Local Citation Finder
3. Click Cancel, and complete the Cancellation Feedback form. Then you're done!