Just explore! (Yes, you can drag the micro:bit, that was on purpose. More coming soon!)
You NEED a micro:bit for this to work, either V1 or V2. Need step by step instructions on how to get it working? No worries! Scratch already has a link to help you! Link: https://scratch.mit.edu/microbit. Once you upload the file to the micro:bit, go in the editor, click micro:bit "drawer" on the left, click the exclamation mark, pair the micro:bit, and you are ready! (All code by me, micro:bit picture found online)