1) Copy your "Shop Instagram" page's link
Go to Shopify Admin > Apps > Shoppable Instagram Gallery and open your first gallery. Then click on "Shoppable page" button and copy a link to Shop Instagram page.
2) Update your Instagram profile
Now let's go to Instagram.com and open Edit Profile page where you need to paste the link into Website field:
Now customers no longer need to hunt down the things they saw in your Instagram in your store, they can easily find them on your Shop Instagram page right on your site.
If you would like to display Shop Instagram link in your site menu then:
3) Open Navigation section
Go to Shopify Admin > Online Store > Navigation and click on Main menu:
4) Add a new menu item
Click on "Add menu item" button and fulfill the fields: type the wished label, choose Page and select "Shop Our Instagram":
Now your site visitors can easily find your Instagram gallery for inspiration and buy the liked items right from images.