How to link my existing domain name

Did you read this article already?

Like the control panel says: you need to update your domain’s nameservers. That’s not the same as creating CNAME records. If you’re not sure how to change the nameservers of your domain, please contact your domain name provider, as they should be able to guide you how to do this in their panel.

What you’ve set up right now are not valid DNS records, and definitely won’t allow you to link your domain to your account.