If you are using the Wishpond popups plugin for your Shopify account, you can easily install popups to your Shopify store. For more information about the plugin, please refer to this page: https://apps.shopify.com/free-popup-builder
When you are all done customizing the design of the popup, click "Next ->" on the top right of the editor to open popup publishing wizard.
Enter the URL of your store page. When you hit Next: Publish, it will automatically add the popup to your store page. There is no need to install Wishpond tracking code on your page, because the Wishpond Shopify plugin will automatically take care of that part for you.
Now when you visit your store, you will see the popup displaying on your store page.