To enable Next & Previous product URLs please go to Product Settings > Catalog Design > Product Page and find the Add next & previous product URLs checkbox.
When you check the Add next & previous product URLs checkbox the URLs will appear on the bottom of every product page. The design will match you theme style but it will look similar to this:
You can also enable additional options regarding the next and previous URLs:
- Next & Previous URLs on top – it will show them on the top of the product page
- Next & Previous URLs inside category – it will redirect to next or previous product within the same category
- Replace back to product with back to previous URL – it will redirect the user to previous URL instead the all product URL when All Products clicked
- Edit next & previous labels – customize the link text