We're sorry to hear you're thinking of leaving the FT Edit. This is done via your iPhone, not through the FT.
Open your ‘Settings’ app and tap on your Apple profile at the top. Then tap on ‘Subscriptions’ and choose the FT Edit from this page to cancel your subscription.
Please note that your subscription will cancel on an end of term monthly basis, meaning your subscription will continue to run until the end of the month after you have cancelled.