I have added nameserver of infinity free to my domain provider but also not detecting the new nameserver it’s detect old nameserver only tell me how to fix
I would talk to the company you purchased the domain off of, and ask them to double check. because it looks like it may not have updated properly on their side then.
Infinity Free have no control over your domain’s name server settings
On the DNS level, your domain name is currently pointing to Cloudflare’s nameservers. On the WHOIS info of your domain, it appears to be pointing to our nameservers, but the WHOIS information can sometimes not match the DNS information of your domain. But given that DNS is what actually makes your domain name work, and it’s much easier to check automatically, that’s what we use to check your current nameservers.
This is a problem with your domain name, not with our panel. Please contact your domain name provider about this. This seems like an issue at the registry to me, not at your domain provider directly, but your domain name provider is your point of contact for problems with your domain name, so they should be able to help you with this.