Step 1:


From your Shopify admin click Online Store:




Step 2:


In the theme that you want to edit, click Actions and then click on Edit code:



Step 3:


Click Layout and then theme.liquid file:



Step 4:


Add the following code wherever you want the widget to show:

<div class="sellify-ucc-wrapper"></div>



Step 5:


Click save and that's it.