The EuroDNS domain plugin gives full DNS management functionality to your customers. As admin, you’ll have access to these options if you log in as your customer. Here’s how to do it.
Log in to your WHMCS admin panel.
Click on the dropdown menu Clients and select View/Search Clients.
Choose the client by clicking on the ID, First name, or Last name.
Click Log in as Client in the Clients Information area on the left side.
Click on the domain name to edit the DNS.
In the Management Tools menu, choose DNS Manager.