Two very important steps are enough
1. The domain should be added to cPanel - to parked domains or addon domains - we wrote about the difference HERE.
2. Change the DNS of the domain so that they direct to WEBD.pl hosting, as a reminder, DNS in WEBD.pl has the following value:
ns7.webd.pl, IP: 188.8.131.52
ns5.webd.pl, IP: 184.108.40.206