AffiliateBooster supports 1 main menu currently, which is also called the header menu. When you first start your website, you have to first create a menu, then assign it to the header. This way you can have multiple menus and change them anytime.
To create a menu, go to Appearance >> Menus inside your admin area, create a menu, then assign it to the header by enabling this checkbox.
Once saved, the menu will appear on your website.
You can customize the look of the menu with the customizer options under Customizer >> AffiliateBooster Theme Panel > Menus > Main Menu.