Hi,

In the theme you can either use the header that comes as default where you can upload the logo from Customizer and manage it from there or via Elementor where you can create headers and assign them to different pages, so please hover onto button Edit with Elementor and see if there appears a header template. https://prnt.sc/ppaaad

Click onto the template and the editor for that template will be opened where you can easily edit it.

- Video Tutorials about header builder.

So, if you're not using any Elementor header it means you're using the default one and on that you need Custom CSS for changes, I will provide below the selector where you can change the color.

ul.menu.m-header-default-menu li.menu-item > a {
    color: your_color !important;
}

Feel free to ask for anything you need.

Kind Regards