changing nameservers

Hello all, I need some help i am not able to set Cloudflare nameservers in Njal.la domain settings, getting error that "setting nameserver failed". SCREENSHOTS - Cloudflare Nameservers i am trying to set - https://ibb.co/HgNTWQH Error i am getting - https://ibb.co/wwBB3qN

I registered a personal domain name subhojitchakraborty.com yesterday from 1and1. I changed the nameservers. Every-time I try to visit my website it's being redirected to http://www.subhojitchakraborty.com/defaultsite I've tried clearing my cache and history. Nothing works. When I try to open...