You can log in your cPanel and use the file manager to remove the builder files. Please see the following links on cPanel.
How to Log into cPanel
Using the File Manager in cPanel
If for whatever reason you cannot delete the builder files, Please contact support either by chat, phone (1-888-321-4678 ext 2), or by email (firstname.lastname@example.org) and let them know what files you need removed and they can get those removed ASAP.
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