If you have Virtuemart installed on your Joomla! installation and you need to customize the confirmation Email, you need to have some basic knowledge of FTP(Except if you are working on the localhost) and HTML. Lets get started by this step-by-step instructions.
Connect to your website via FTP or access your files on your PC locally usually in the HTDOCS folder if you have Apache installed. This can only be done if you have access to those files.
Follow the below path in the root folder of your Joomla! installation.
Locate the filename with the default language of your Virtuemart Installation with the php file extension, open the file and edit the HTML to fit your needs. That’s all and now you should be able to edit your Virtuemart confirmation emails.