Try to remove it (highlight it on the Home Screen and press * on your remote), restart your Roku from Settings->System or Settings->Power if it's a Roku TV (or just unplug the power for a few seconds and plug it back in), then reinstall the channel from Streaming Channels.
You can check their website for ways to subscribe ( https://www.hbo.com/ways-to-get ), but you'll still want to do the remove, restart, reinstall procedure.
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