Hello,
To change the colors of the links you need to use Advanced typography settings Under Theme Settings >> Typography.
Screenshot for Clarification: https://ibb.co/zS5PGLM
To change the background-color of the main menu you need to Go to WoodMart >> Header Builder. Row background in which the menu is added.
Screenshot for Clarification: https://ibb.co/ynB2V6X
You can also read our detailed documentation in the following link:
https://xtemos.com/docs/woodmart/advanced-typography-settings/
Best Regards.