Adding CNAME record for a domain with subdomain
In this case your custom domain will look like
calendar.yourbusiness.com
Log in to your Network Solutions dashboard
Select Domains on the left side of the page
Select your domain and click on Advanced Tools
Click on Manage next to Advanced DNS Records.
Click on ADD RECORD
Select CNAME as the
Type
and Other Host forRefers to
Add Hostname and Alias To
Click on ADD
For more information refer official documentation
Adding CNAME record for a root domain
In this case your custom domain will look like
yourbusiness.com
Follow the same steps mentioned above