Hello,

You are Most Welcome.

I saw the screenshot you attached.

1) To Change the background of the header you need to Go to WoodMart >> Header Builder >> Edit Header.

Screenshot for Clarification: https://ibb.co/80XyCLQ

2) To change the color of nav links you need to Go to Theme Settings >> Typography.

Screenshot for Clarification: https://ibb.co/6XGTbJG

You can read our documentation for further help:
https://xtemos.com/docs/woodmart/advanced-typography-settings/

Best Regards.