Your Webdock server IP address is not your nameserver. Nameservers are supplied by the vendor that sells you the domain typically, or you get this service from a 3rd party. We recommend Cloudflare as it is easy, free and feature-rich.
So, simply sign up to Cloudflare, add your domain there and they will supply you with Nameservers. Finally you’d point A and AAAA records in your DNS Zone to your Webdock server ip.
Some more info here: