To get ESPN on your Firestick, you'll need to download the ESPN app from the Amazon Appstore. It's super easy and only takes a few minutes. Just search for "ESPN" and click "Get" to start the download process.
Once the app is installed, you'll need to sign in with your ESPN account or create a new one if you don't have one already. Don't worry, it's free and only takes a few seconds. You'll also need to activate your device by visiting the ESPN website and entering the activation code displayed on your Firestick.