Use a Custom HTML section or the theme code editor.
<script src="https://feed.tinyboost.net/widget.js" data-widget-id="YOUR_WIDGET_ID" ></script>
Replace YOUR_WIDGET_ID with your actual widget ID from the FeedFlow dashboard.
In your Shopify admin, go to Online Store → Themes and click Customize on your active theme.
Click Add section (or Add block, depending on your theme) and select Custom HTML or Custom Liquid.
Paste your FeedFlow embed snippet into the HTML field. Click Save.
Drag the section to your desired position. Click Save to go live.