You go to "YOU" (top right corner) and then YOU again and the click on the icon SETTINGS (a clog) and at the right side a box named "unredeemed memberships" where you'll see you membership status and a button "More Memberships". Click on this button and you'll open a page with your membership plan and the option to cancel the auto-renewal. Cheers
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You don't. Change the e-mail address under Settings, and forget about it. Unless you did actually authorise a payment? then you see what frollard said. L
Direct from Ewilhelm's forum post:If you bought your pro membership via PayPal, you can manage or cancel your subscription directly on PayPal:https://www.paypal.com/cgi-bin/webscr?cmd=_subscr-find&alias=WJQEXRATPTUBN PayPal instructions for managing your subscriptions:https://www.paypal.com/helpcenter/main.jsp;?cmd=_help&serverInstance=9006&t=solutionTab&ft=searchTab&ps=solutionPanels&solutionId=11750&isSrch=Yes If you bought directly via Instructables, send an email to service@instructables dot com with your Instructables username and we'll take care of it for you.
You've paid for it.... you may as well keep it. If you don't use it though, and you don't want all the emails you could turn them off in your account management section.
I think (s)he's wanting to know how to unsubscribe from monthly pro membership...