Collection list - how to display description in Craft theme

[Giuliuz]

Hello, 

I am using Craft theme and I'd love to add description under every item in the list.

1) the description I will use is the default description field of the product

2) This is the place I want them to be shown:

I have seen different solutions like adding 

<p class="collection-product-description"> {{ card_product.description | strip_html | truncate: 60 }} </p>

in the card-product.liquid file, but my files are different from those examples and I don't know where to add this code.

Thanks!
Daniel