Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
My advice would be to subscribe to the channel directly on its website. This will enable you to watch the channel on any platform the channel supports -- browser on a computer, app on a mobile device, app on a streaming device, etc.
Install the channel's app on your friend's Roku and log in with your credentials from the channel. Uninstall the channel from your friend's Roku before you leave.
When you get home, install and log in there.
Roku Streaming Stick +, 3810X, Ser YH0059427035, wifi - Samsung UN55ES6100
Roku Streaming Stick, 3600X, Ser 5S56D8240827, wifi - JVC EM37T