How to edit invoice template

You can do that by customizing your invoice template. You can find information about that here: https://kb.jetpackcrm.com/knowledge-base/templating-how-to-change-templates-pdfs-portal-emails/

We are not able to help with customizing Jetpack CRM on your site, as it goes beyond our scope of support. The information in the article above should help you start creating your own customizations though!