Make sure you are logged into BigMarker. Then from your personal home page, choose the Channel that you'd like to upgrade, downgrade or cancel. You need Admin privileges to update a channel's billing plan. There are a few ways to get to the billing section of your channels.
From your personal dashboard:
From your profile settings:
From your Channel Settings:
All options will send you to your Billing Section. From there you can downgrade your plan or cancel it. Keep in mind the BigMarker free plan has limited features, limits capacity to 5 attendees and does not offer recording. However, all webinars and subscribers stored and saved. This is recommended if you plan on hosting in the future.
In this section you can change your billing plan, or switch to the free plan.