I’m using WPBakery – is there a way to change the colour of the stars
See the Site Reviews > Help & Support > FAQ page to learn how to customize the rating star images. Alternatively, you can use the Review Themes addon to customize the stars.
and also the ‘submit review’ button?
Try changing the Site Reviews > Settings > Plugin Style setting. If none of those options suit you and your theme does not provide default button styles, then you will need to use some custom CSS.
I know where the short code page is – the link you shared is to a drag and drop builder. How do I use this on WPBakery? Please provide a detailed explanation 🙏