FOR MULTIPLE DOMAINS YOU SAID IN A CLOSED TOPIC:
There are two ways to do this.
The recommended way is the one you began:
At your domain name registrar, change the domain’s nameservers to ns1. + your box hostname and ns2. + your box hostname. (You did that.) Note that this is not glue records or DNS records.
Use the Custom DNS page of the Mail-in-a-Box control panel at https://yourboxhostname/admin to set the appropriate DNS records to point the domain back to your web hosting provider. Your web hosting provider should have instructions for that. It typically involves A (and possibly AAAA) and/or CNAME records. In a simple setup you add an A record with the IP address of your web server, but you should check with your provider. You probably already did this when you set up your website originally — it would be the same instructions, but now your Mail-in-a-Box is where your DNS control panel is.
FOR DIGITAL OCEAN CAN YOU PLEASE BE MORE DETAILED IN SETTING UP FOR THE 2ND METHOD PLEASE? THANK YOU!
The second method is what we call “external DNS”:
You leave your nameserver settings for the domain as they are — i.e., you already have a DNS server / control panel. It’s often provided by the domain name registrar.
Copy in DNS records for Mail-in-a-Box by referring to the External DNS page of the Mail-in-a-Box control panel.
WHICH RECORDS SHOULD WE USE SIR???
You will need to decide which records you need and keep them updated if they potentially change, and some DNS control panels have trouble with some of our records.
WHICH RECORDS SHOULD WE USE SIR???
DNSSEC is also not supported this way.
HTH.