@Carebear27, assuming you subscribed to Paramount+ directly with them and not through some third party like Amazon, Apple, etc., you just install the Paramount+ app on your Roku device and sign in with the same credentials you'd use on Paramount's website. Don't try to access Paramount+ through the Roku app known as "The Roku Channel". You can't use your credentials there.
https://channelstore.roku.com/details/32b338eebb16d1de34870b6b1d674911/paramount-plus
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