While Roku delivers a range of free content, many of its premium channels require a paid subscription, and you or someone with access to your Roku box may sign up for a channel without realizing it. A small charge might start appearing on your credit card bill monthly. You can manage subscriptions on the Roku website or on your device. On your device, choose the channel and press the asterisk button to get to the Manage Subscription option. There you will have the choice to cancel. If you want to see all of your active subscriptions, use the Roku website and access them under My Account.