First, go to the home page on your Roku. This is where all your channels are. Once at your home page, move on to the next step.
Use the up and down arrows on your remote to navigate to the channel you are wanting to cancel a subscription for. Once you have found the channel and navigated to it, move to the next step.
In my case, the channel I need to navigate to is STARZ.
Notice the channel is highlighted after navigating to it? Now press the asterisk "*" so that the pop-up for managing the current subscription can come up like pictured.
Now, click manage subscription, so that we can get the cancellation option.
Select "cancel subscription."
Continue with the cancellation and confirm the cancellation by clicking "yes, cancel subscription," and you are good to go!
Now, you can work through the rest of the Roku subscriptions you probably shouldn't have started. It happens to the best of us!