To connect a domain to use for your affiliate link, go to the top menu in the Builderall dashboard and click "Affiliates"
Go to the affiliate menu on the left and click "Domain" and "Connect domain"
Enter your domain name (or purchase a domain directly from Builderall).
Once you add your domain, you will then be given the necessary nameservers or IPs you need to add to your domain hosting so the domain can be pointed to Builderall.
IMPORTANT NOTE: If you are not familiar with how to add the nameservers or IPs to your domain hosting, contact their support and typically they will assist you in pointing your domain to Builderall.