1. Login to your cPanel and click on the Sub Domains icon (cPanel &gt; Subdomain)

2 Enter the prefix for the subdomain in the first blank field, and click Add.

Note: If the subdomain was added successfully, the following will appear (except sub.domain.com will be the prefix you are using, and your domain):

SubDomain Adder
The subdomain, sub.domain.com has been added.