To cancel your Premium Membership, sign into the Bowen EHS Member Center, and look for My Membership on the side of the page. Click on "Manage Subscription", and a new window will open with your subscription details.

From here, you can go to the "Actions" section of the page, and select "Cancel plan at the end of this term" (red and white button - example below).

action switch cancel

Your subscription will be cancelled on the date shown as Expiration Date under "Subscription Details".