Hello,
1) To change the main-menu color Go to >>Theme Settings >> TYPOGRAPHY >> ADVANCED TYPOGRAPHY, choose “Main Navigation Links” and select the color and save the changes.
Screenshot for Clarification: https://ibb.co/gVCYJBr
2) To reduce the space between the modules Edit the page with Wp-Bakery page Builder >> Edit product categories >> Space between Categories.
Screenshot for Clarification: https://www.screencast.com/t/0Oh3czzy9b3
3) To set images in the modules Go to >> Products >> Categories >> Edit the category you want to add an image to.
Screenshot for Clarification: https://www.screencast.com/t/fnxB2I1xf8
4) To Change the color and font-size of the titles Edit the Page with Wp-Bakery Page Builder >> Section Title.
Screenshot for Clarification: https://www.screencast.com/t/mThycuPnhgmr
If you are unable to adapt to the changes then provide us with admin panel login details to check it myself and help you out accordingly
Best Regards.