The dial is a component in the kit. It can be turned left, right, or pressed as a button, and can attach to blocks that come in the kit.
This video will guide you through the basics of how to connect the dial to the kit breakout board, and how to use the dial code blocks in MakeCode.
Dial Component | Tutorial
MakeCode Blocks
The Forward Education extension comes with several new blocks you can use to control the dial. Download the sample code below to your micro:bit to get started with testing your dial.