How do I change the operating system on a Dell Chromebook?

No you cannot change the OS. You have to buy a windows computer.

The Chrome OS is the whole point of a Chromebook. Chromebook Help (google.com)

Welcome to the Dell Community @bhthd564 

There is a limited number of models that have had W8.1 or W10 installed.

What is your model number???

https://www.howtogeek.com/278953/how-to-install-windows-on-a-chromebook/

If you want to reinstall the Chrome OS then you can download it here.

https://chrome.google.com/webstore/detail/chromebook-recovery-utili/pocpnlppkickgojjlmhdmidojbmbodfm?authuser=0

Best regards,

U2

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@bhthd564 wrote:

How do I change the operating system on a Dell Chromebook?

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You can't.

A Chromebook runs ChromeOS.