We're very sorry to see you go! Please consider filing a support case with us and seeing if we can help in any way.
Cancelling - and you have the Chrome Extension Installed
From the extension, navigate to the Billing tab, using the Gear to get to Salesbolt Settings.
Then click the button "Cancel Subscription".
This will take you to the Stripe Billing Portal, where you will see a button "Cancel Plan". And then you can cancel.
Cancelling - and you have uninstalled the Chrome Extension
If you have uninstalled the Chrome Extension (or your Salesforce User/Org is inactive), there is no self-service way to cancel. Please file a case using this support portal. https://salesbolt.freshdesk.com/support/tickets/new