SSL and nameserver change

I got an email from you to get an ssl certificate for my sites and to do that I have to update my nameservers with my domain name registrar. I registered one of my sites through Homestead and tucows. I have found where to change those nameservers on my homestead account for mingdinhhomeopathy.com under Domains/Edit your name servers. Do I just do that there, or do I have to go to tucows? I tried doing that and found that site has no password or email address for me???