Mailerlite authentication

MailerLite needs me to authenticate my Domain. I registered with Cloudflare and edited the nameservers under nnecsi.org (homestead site). This morning, I saw the two Cloudflare nameservers listed under our other domain (nhcsi.org). I just went back and edited the nnecsi.org to see if that works. Can you help me? What am doing wrong?

Thanks, Wayne

After doing this, I just received a notice that nnecsi.org is active under Cloudflare, so it worked (I hope)!