Nameservers tell registrars which DNS cluster is authoritative for your domain. When your domain uses HostStack-provided nameservers, HostStack DNS zones can be managed alongside your hosting — helpful if you want support to sanity-check records.
At your registrar, replace the existing nameserver list with the pair supplied in your HostStack welcome email or client-area service details. Save changes once — duplicate edits can extend registrar-side locking windows.
SSL & DNS together
HTTPS issuance usually requires the hostname to resolve correctly first. After nameserver updates, wait for propagation before expecting AutoSSL-style provisioning to succeed.