How to add a pop-up link to a button on shopify?

Hi @loubiblu,

Thanks for sharing this question with our community.

To simplify this process, I’d try inserting the URL we provide for a given Klaviyo list in the Shopify button calling for a webpage. This link (2nd screenshot below) will lead the user to the Klaviyo subscribe page for that list. You can also add fields to that subscribe page to collect additional information about your subscribers - you can read more on that here.  

You can find the URL for your lists’s subscribe page by navigating to the list > subscribe & preference pages > subscribe (button)

You’ll see a button that says, "Copy URL". this is the URL for the subscribe page for that list.

Alternatively, you can also consider embedding the Klaviyo subscribe page as a discrete form on your site.

To embed this page on your website, simply copy the following snippet of code to your site and replace SUBSCRIBE_URL with the URL for your page.

<iframe id="klaviyo_subscribe_page" src="SUBSCRIBE_URL&embed=1" seamless="seamless" width="100%" scrolling="no" ></iframe> 
<script type="text/javascript" src="//a.klaviyo.com/media/js/lib/iframeresizer.js"></script> 
<script type="text/javascript">iFrameResize({}, '#klaviyo_subscribe_page');</script>

Lastly, you can consider adding a simple pop-up to the page on your Shopify store. You can control what page the Klaviyo pop-up populates through the behavior settings of the form. Here’s a community post outlining how to achieve that:

I hope that information is helpful.