Hi,
Normally, after you install HikaShop on your website, you have a "categories listing" menu item which is pre installed and pre configured for you inside the "HikaShop hidden menus" menu in your Joomla menu manager.
So you just have to move that menu item in your main menu (and set it as the default one if you want it yo be used for your homepage).
Now if you can't find it, you can always create a menu item of the type "HikaShop categories listing" via the new button of the Joomla menu manager and it should work like that.
Now for more details about setting up menu items for HikaShop, we have a tutorial available here:
www.hikashop.com/support/documentation/3...splay-front-end.html