Hello, buddypress and woocommerce pages are Dynamic pages, they cant be edited using the page editor, to edit them you need to edit the templates, that is why visual composer does not work there.
If you need to edit them you will find them at the buddypress and woocommerce folders of the main theme, copy them to the child theme and then edit as you prefer. To add visual composer shortcodes you need to use php do shortcode to use visual composer elements, i suggest to hire a developer that can do that for you 🙂
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