Want to add product thumbnail slider instead of stacked images

[sroz]

For this page want to have main product large, and create thumbnail slider for other images below with slider arrows (not stacked images like it currently is in the Shopify Reformation theme). 

Current page: https://fastingsupport.com.au/products/fasting-support

Would like thumbnail slider like this:
https://ancestralnutrition.com.au/products/primal-energy?variant=42599414333598&currency=AUD&utm_med...