Add copy beneath our photos on my shopify store

We are currently only able to add copy to the body of product pages and we cannot add below our product images, where there is a large amount of whitespace. Please take a look at the site here:
https://www.gwentpets.com/products/lavender-wave-shampoo-with-hints-of-aloe-vera-chamomile

We previously used an ~endsection~ key word to have copy appear below the photo.

We have had this work completed in the past on another one of our websites but our usual developer is away currently, please let us know costs and timescales.

Thanks,

Chris