Hello,
1. Please watch “Legenda WordPress Theme – How to create footer” – https://www.8theme.com/videos/ read more – https://www.8theme.com/demo/docs/legenda/#footer
Edit product > Additional product options [8theme] > Size Guide img.
2. Our theme uses default woocommerce functionality. You can maybe find a plugin that can provide this functionality. The theme has no such features implemented.
Regards