Follow the below instructions to set up your CPanel custom domain with your learnyst account
Log into your cPanel account
Click the Advanced Zone Editor button in the Domains section
Click the drop-down menu, and choose the domain you want to edit the DNS for
Click the drop-down menu under Type, and choose CNAME
You will then see Name, TTL, and CNAME options. Below is an example of the options
Fill the CNAME as pro-ssl.learnyst.com and click on the Add Record button (If you are in regular plan and above and using HTTPS certificate, instead of adding your learnyst url, add "ssl.learnyst.com").
You are finished when you see a message stating "The system successfully added the record."
You will also see the new CNAME listed now.