How do I add a 'read more' button under my product description? Impulse Theme

[Fleurdinand]

Hello,

I am wanting to add a 'read more' button under my product descriptions. I have found resources that explain how to do this with code BUT I cannot find the areas in my liquid files that need to be replaced wth the appropriate code. 

I can't find this part {{ product.description }} in the main-product.liquid or product-template.liquid files....so I don't know where to add the appropriate code?

I am using impulse theme and my website is this - https://fleurdinand.com/

Any help would be much appreciated!
Thank you!
Alex