How to add item in the cart

<iframe width="560" height="315" src="https://www.youtube.com/embed/6FQsIfE7sZM" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe> 

<script src="https://youtube.com/embed/6FQsIfE7sZM"></script>

<script src="https://youtu.be/xU0yMXUuiX8"></script>