By default, it will always display below the primary menu, as by nature it’s the secondary menu.
It’s possible to move them, but I’ll need to know which position you have them in (Below Header, Above Header etc..).
The colors can be changed using the Colors add-on. If you can’t get that, you’ll need to use CSS.
For the CSS, you can use this: https://gist.github.com/generatepress/793804f553c25c70823c
However, you’ll need to change
.secondary-navigation throughout the code.
Hope this helps 🙂