Follow these steps to delete an addon domain:
1. Log in to your cPanel account.
2. Click on "Addon Domains" in the cPanel interface.
3. Scroll down to the "Actions" section located at the bottom of the Addon Domains page.
4. Click on the "Remove" option associated with the addon domain you wish to delete.
Please note that deleting the addon domain only removes it from the DNS and server configuration. Your files and databases associated with the addon domain will not be deleted or affected, except that you will no longer be able to access them using that domain name.
By following these steps, you will be able to successfully delete an addon domain from your cPanel account.
If you encounter any issues or need further clarification, please contact us.