I am trying to change the nameservers for my domain mystikos.net to Cloudflare. I have successfully added the Cloudflare nameservers (major.ns.cloudflare.com and evangeline.ns.cloudflare.com). However, I am unable to remove the old Dynu nameserver (ns6.dynu.com) because the delete option is disabled.

Could you please assist me in removing ns6.dynu.com so that my domain can fully switch to Cloudflare? Let me know if any additional steps are required