First, you should create 4 Name Servers at your domain registrant using following IPs:
Custom Name Server IPs:
NS1 > 185.136.96.181
NS2 > 185.136.97.181
NS3 > 185.136.98.181
NS4 > 185.136.99.181
When they created, change your domain Name Servers to your new created Name Servers. After update contact us for DNS server update from our side.
