This video demonstrates how to use the buttons to change the display on your micro:bit.
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Getting started https://youtu.be/mdCPl0goQVg
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Step counter https://youtu.be/alXfD4pM75k
Get a micro:bit from amazon: https://amzn.to/2XwyAa1 (affiliate link)
Windows 10 editor: https://www.microsoft.com/en-gb/p/makecode-for-micro-bit/9pjc7sv48lcx
Browser editor: https://makecode.microbit.org/