Log in to your hosting provider and find the "DNS Record" :
Select your domain name :
Add a first entry with a pointing field "NS" using the subdomain you previously selected in your GTM (e.g., xyzxx) and the nameserver URL "ns1.gtm-helper.com."
Repeat the operation a second time for the same subdomain, with the nameserver URL "ns2.gtm-helper.com."
