@Jack3109, you can add it yourself by searching under "Streaming channels" or "Streaming store" or whatever they're calling it these days. If it doesn't show up then it's either not available in your region or your device doesn't support it. You can also add it from the website:
https://channelstore.roku.com/details/32b338eebb16d1de34870b6b1d674911/paramount-plus
If you're still having problems, reply with your location and the model number of your device that's displayed under Settings->System->About on your Roku device.
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