How to add a subdomain?
If you want to add a subdomain, go to https://CBA.pl/panel/en and enter the login details (1) i.e. the email or profile name to the user panel, 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 (1): https://CBA.pl/panel/en/domains, and click on the "Subdomain" button (1) under the "Action" column for the domain you wish to add a new subdomain.
Enter the "Subdomain name" (1) and click on the "Add" button (2).