If it asks you to upload something to a folder, you'd need FTP or SSH to upload the files in your vBulletin home folder. For example if your vBulletin resides in public_html folder on the webserver and the file asks you to upload to hack_mod.php, you'd have to upload hack_mod.php in the public_html folder using FTP.
After you finished uploading you can add the XML file as a product in your vBulletin Admin CP using Plugins and Product manager.
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