Hello,
Thank you very much for choosing our theme and for contacting us.
1. Please navigate to Woodmart > Header builder http://prntscr.com/iyd2pe
Choose the proper header type (your current) http://prntscr.com/iyd333
Find and enter the Categories element, hover to edit http://prntscr.com/iyd3h3 and you will find the option to set the color.
2. You need to assign attributes to the product and enable showing on the product page: https://gyazo.com/4ab9b6f11cbc07e1938e854a8cb0cbc1
Then you need to enable showing the attribute table in the Theme Settings > Single Product > Show /Hide elements: https://gyazo.com/a486b0b43bd1d1701f5a0a8318dfdd12
3. You can enable border in the Theme Settings > Product Archives > Product Styles. As for the border-radius, please provide the page URL and screen of the elements you want to add the border. We will give the custom CSS.
Best Regards