DNS problem - showing DNS provider backing netlify domain

I need help on DNS pointing, it says “A Dns zone for this domain is already exsits on NS1, the DNS provider backing netlify DNS”

for this domain www.36t.club. i have the domain but need to exclude all who using in netlify.

i need to give access to my developer only

See this support guide

You’re expecting to only allow your developer to have access to the domain?