You post here which subscriptions you want to be cancelled, and Paizo will cancel them as soon as they can. Likely when the snow finally stops and they can get back to their office.
Hello IveDefected,
I have canceled your Starfinder subscriptions. You should soon receive an email confirming this change to your account. This will also cancel any pending items generated from these subscriptions.
Thank you for your patience while we waited out the unsafe weather conditions to return to the office! If you have any questions or concerns, please let us know. Thank you!