While using SiteGround\'s name servers your domain will be pointed to your hosting account, and its active DNS zone will be situated on your joomla site hosting server.
In this case you can edit your DNS records directly in cPanel using the DNS Zone Editors.
To change a CNAME record you need to:
Go to cPanel -> Advanced DNS Zone Editor -> Adjust the desired CNAME record from the list.
Note that you should set a valid domain/host as destination for the CNAME record as it does not accept IP addresses.
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