Exposing the approved testimonials in the online store is pretty easy.
1. Login to your Shopify Store Admin
2. Go to Online Store > Navigation > Main Menu > Edit Menu
3. Click the Add Menu Item button, and now you should have an area to new the new menu item
4. Enter "Testimonials" as Name
5. Select "Web Addresses" as Link
6. Enter "/apps/testimonials"
7. Dont forget to click Save Menu to finalize your changes
That's it!