Hello,
Thank you very much for choosing our theme and for contacting us.
Please save the Theme Setting and clean the cache to make the icons show.
As for the categories your problem is not clear enough.
If you do not want Browse categories are always open, you can set this in the page – https://xtemos.com/docs/woodmart/options-for-pages/
If you want to change the menu you need to create yours in Appearance > Menu
Navigate to Woodmart > Header builder http://prntscr.com/iyd2pe
Choose the proper header type (your current) http://prntscr.com/iyd333
Enter the Category element and choose your menu: http://prntscr.com/iyd3h3
Best Regards