1. Make sure that Custom Metaboxes and Fields for WordPress plugin is enabled.
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2. You can use custom css code (add the code in Theme Options > Styling > Custom css or in style.css file of child theme).
3. You can add content in “Product Page Banner Content” area (Theme Options > E-commerce > Shop) or in Products > Categories > Edit category > Description
4. Contact us once you move the site to live server and we will help you with custom css code.
5. By default, there is no such possibility.