If you want to cancel your Bugfender subscription, we will be grateful to hear your feedback, be it positive or negative, before you go.
That said, cancelling is easy:
In the left hand side menu, select Team Settings
Click on Change Plan
Select the FREE plan, you should see a change confirmation dialog
Your subscription is now cancelled and your account downgraded
Please note only team owners are able to change a plan's team, including cancelling the subscription.