1. Log in to your cPanel account.

2. Find and click the "Subdomains" option under the "Domains" section.

3. Enter the subdomain name and specify the Document Root. The Document Root is the folder inside your main domain’s directory that will load when the subdomain is accessed. The content of this folder can also typically be accessed via a corresponding path like yourdomain.com/subdomain.

4. Click the "Create" button to complete the setup of your subdomain.