Squarespace doesn't use nameservers for connecting domains. Instead, we use two CNAME Records and four A Records. To connect your domain, you'll need to keep your nameservers set to your provider's default settings. You'll also need full access to your domain's DNS (Domain Name System) records to add CNAMEs and A records.
If you can't access your domain's DNS records, you may need to contact your domain provider or transfer your domain to a provider that allows for full DNS access.
To learn more about connecting domains, visit our guide.