After you create your campaign in Viral Loops using Leaderboard/Tempting/Prelaunch campaign, from your home page on Shopify, you select "Online store":
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and then you select "Pages":
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Then, you select "Add Page".

After that, you should set a title for your page and on the content area, you select the top right button "Show HTML":
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There, you add firstly the HTML of the button:

            <div data-vl-widget="popupTrigger"></div> 

and below that, add the Javascript Snippet of your campaign. You will find in the Installation Step of the Campaign Wizard:

Like so:

Finally, on the right corner, select the template where you want to add your campaign, select "Save" and you're ready!

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