To add Paramount Plus to your Fire TV, you'll need to head to the Amazon Appstore and search for the Paramount Plus app. Once you've found it, click Get to start the download and installation process. Easy peasy!
Once the app is installed, you can launch it and sign in with your Paramount Plus credentials. If you don't have an account yet, you can sign up for one right there on your Fire TV. The app will guide you through the process, and before you know it, you'll be binge-watching your favorite shows in no time!