Help install a popup in Shopify

Hello,

I've created a pop-up within the Free From Builder app by Powr and need help installing it on a CTA button on the homepage slider within Shopify.

Already have the code, just need to know where to put it (I'm a designer with limited coding knowledge).

This should be as simple as a coping & pasting into the right place.

Would be so grateful for any assistance.

Thanks!

Pete