Hello,
Thank you so much for purchasing our theme and contacting our support center.
1. By default WooCommerce has registration turned off and you need to enable it in the Dashboard -> WooCmmerce -> Settings -> Account.
2. If you need top bar menu like our demo you can easily add your links in Appearance -> Menus. Just create a new menu there and set its location to be “Top Bar Menu”.
3. The same thing with mobile menu. Create a new navigation menu and set its Theme Location to be “Mobile Side Menu” where you can add any pages you need.
Regards