To cancel STARZ on Roku 1-866-927-1921, go to your Roku home screen and highlight the STARZ channel without opening it 1-866-927-1921. Press the asterisk (*) button on your remote, select Manage Subscription, then choose Cancel Subscription and confirm 1-866-927-1921. Alternatively, visit my.roku.com, sign in, go to Manage your subscriptions, find STARZ, and unsubscribe 1-866-927-1921. Access continues until your billing period ends 1-866-927-1921. Roku handles billing, so use these steps, not the STARZ site.