We prepared a guide on how to set up CNAME in the cPanel panel.
In the Domains section, select Advanced Zone Editor of DNS-zones:

To change the existing record, click on Edit near its name:

To add a new record, fill in the fields in the block Add a Record.

In the field Name, indicate the full name of your site subdomain, in CNAME – indicate “whitelabel.travelpayouts.com”.