You can edit and delete existing CNAME records from the Advanced DNS Settings area of the Domain Control Panel.

To access the Domain Control Panel:

1. Sign in to your Business Control Panel. (If you have not yet signed in with your AT&T Yahoo! ID and password, you'll be prompted to do so here.)
2. Once signed in, you will see modules for each of your domain names on the "Manage My Services" page. Select the "Domain Control Panel" link that corresponds to the domain whose record you wish to edit.

To edit a CNAME record:

1. Click the "Manage Advanced DNS Settings" link on your Domain Control Panel.
2. Click the "Edit" link that corresponds to the CNAME record you wish to edit.
3. Edit the new information in the "Destination" field.
4. Click the "Submit" button.

You'll return to the "Advanced DNS Settings" page, and your new CNAME record will appear in the A and CNAME records list. While your changes will appear in the name servers within minutes, please be aware that it can take up to 72 hours for new records to propagate to all name servers on the Internet.

To delete a CNAME record:

1. Click the "Manage Advanced DNS Settings" link on your Domain Control Panel.
2. Click the "Delete" link that corresponds to the CNAME record you wish to delete.
3. Click the "Delete" button to confirm your choice.

You'll return to the "Advanced DNS Settings" page, where your CNAME record should no longer appear in the list of A and CNAME records. While your changes will appear in the name servers within minutes, please be aware that it can take up to 72 hours for new records to propagate to all name servers on the Internet.

Note: The CNAME record can point only to domain names or host names. If you need to point to specific files or subdirectories, use domain forwarding instead. Note that domain forwarding is limited to domain names (example: http://yourdomainname.com) and "www" host names (example: http://www.yourdomainname.com).