Just go to the page, where you want to add an Instagram feed. Copy code and paste to wherever you want to show your feed on your website.
Follow the below direction to add Instagram feed at your store
1. Copy Embed code.
2. Click on the online store > Actions > Edit Code
3. Basically, when you install the app at your store. A shortcode will automatically attach with the Index.liquid and the Instagram feed will show on your site.
4. If you want to have Instagram Feed at a different location you can simply copy the same code and paste in other different themes to show on your store.
Suppose: You want to show on product page select product.theme.
5. Save changes and check Instagram feed on your store.