If you subscribe to any service thru Roku, you can find the subscription listed under your user account on your account web page (https://my.roku.com). If you can't find anything listed there, then Roku can't help you with your subscription. If it is listed there, you can cancel it there, although you won't get a refund, the subscription will end at the end of your current subscribed period.
You really hadn't told us what the issue is. Are you saying that you can't use the Acorn TV channel because it won't accept your login? Usually when you subscribe to something thru Roku, that service is only available through The Roku Channel, and not using the stand-alone channel. Since I don't have that service, I can't say for certain if that's the way it works on a Roku. If you desire to access their content on something other than a Roku, then you must subscribe directly with the provider. This support page provides additional detail about handling your subscriptions through Roku.
Dan
Roku Community Streaming Expert
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