How to change DNS and MX records?
If you want to add or edit DNS records, go to https://CBA.pl/panel/en and enter the login details (1) i.e. the email or profile name to the user panel and the password that were set at the time of registration, and then click on the "Sign in" button (2).
Go to the Domains section in the user panel: https://CBA.pl/panel/en/domains, and click on the “Edit” button (1) in the domain row you wish to configure.
Select the "Name Servers" tab (1), enter the name servers (2), and click on the "Save" button (3).
To change MX records, please follow the instructions here.