If you already have a website published on your domain, note that editing the “www” record will replace your website with the landing page. To avoid this, please create a new CNAME record and configure it using the guide below.
1. Log in to your account at godaddy.com;
2. Click on DNS next to the domain you want to add the subdomain to;
3. Go to the bottom of the Records list and click on Add;
4. Select CNAME for type, enter what subdomain you wish to publish your page to in the Host field and make sure it points to secure.pageserve.co and don't forget to save.