Your cPanel includes a feature to add CNAME records, however, because the mail.mydomain.com subdomain already exists, it will not allow you to edit it. The feature in cPanel can only allow you to add new records, not edit existing records.
To update a CNAME for a subdomain that already exists:
To create a CNAME for mail.mydomain.com, you'll need to contact our Support Department and request the change. To do this, you can email firstname.lastname@example.org with your request. As our Support Team will need to make changes to your account, they will need for you to authorize the changes. You can do this by including in your email either the last 4 digits of the current credit card on file or with your current AMP password.
If you're working with Google Apps, you may need to update MX records as well (if you haven't done that already). If you get to this step, be sure to read How to Modify your MX Records for help with changing your MX records to working with Google Apps.
I hope this helps answer your questions! Feel free to update your question or post a comment if we can help any further.
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