How to add a computer to a domain?

It's a pretty straightforward process. First, open your System Properties. A quick way is to right-click 'This PC' and choose 'Properties'. Next, click 'Change settings,' then the 'Change…' button. Select the 'Domain' option and type in the full domain name. You'll need an account with permissions to join the domain. You'll be prompted for those credentials. After that, simply restart your computer. You'll then be able to log on with your domain account.