You can cancel using the following methods:

VIA THE EMAIL INVOICE. Members can click on the link found at the bottom of the email invoice they receive after every payment.

LAUNCHPASS BOT. Discord members can now send "cancel" to the LaunchPass bot to get their cancel link. Locate the bot on the server's users list on the right panel.

USING YOUR LAUNCHPASS DASHBOARD. As the group admin, you can cancel member/s subscription through the "Activity" menu on your LaunchPass dashboard. You can use the member's email to filter your activity feed then click on "Cancel Subscription". 

Note: Deleting an invite page will not cancel members who subscribed to that page.