In order to receive Twitch Drops, you'll first need an MLB The Show account.
If you don't have one yet, head over to that FAQ to get started.
Once you're logged into an MLB The Show account, scroll down to the Twitch Drops portion of your dashboard and select the button that reads 'LINK YOUR TWITCH ACCOUNT'.
From there, follow the on-screen prompts and select 'Log in' under the Twitch icon. After logging into Twitch, please select 'CONFIRM LINK' to finish your connection.
Other Useful Twitch FAQs: