Create widget area in navigation bar (on the right)

Thank you for the awesome theme! I am working in a child theme of Clean Box and would like to create a widget area in my navigation bar, on the right (to replace the header-toggle button. I've registered the widget area so that it appears in WordPress Widgets, but I now need to make it active in the navigation bar. I understand I need to call the dynamic widget area on the header toggle button, using dynamic_widget(), but am not sure exactly where in the child theme I should add this code. I am working locally, so I unfortunately can't include a URL. I'd be very grateful for any advice.