Did you subscribe through "Acorn on The Roku Channel" or through the Acorn stand-alone channel/app? They're not the same, but I would think either subscription should show up in your account at https://my.roku.com . Just make sure you're logging in using the email address that's displayed on your Roku device under Settings->System->About.
If you subscribed through the stand-alone channel/app, you should be able to highlight the icon on the Roku Home Screen, press * on your Roku remote, and a "Manage subscription" option should be there. If you manage to get it canceled, do yourself a favor and subscribe directly with Acorn to avoid the issues many have with subscriptions through Roku.
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