Follow these steps to remove an addon domain in cPanel:

1. Log in to your cPanel account.
For instructions on how to log in to your cPanel account, please click here.

2. Under the Domains section, click Domains.

3. From the list of domains, click the Manage button for the domain you wish to remove.

4. Click the Remove Domain button. 

Note: This will not delete the files or directory associated with the domain. To remove the files and directory, you must action it through File Manager.

5. Click the Yes, Remove This Domain button to confirm and proceed with the domain removal.