clickable catalog thumbnails and gallery display

How do I make product thumbnails in related products and shop (catalog) page click through to the single product? It had an add to cart wrapper that was removed and now it just hovers.

https://www.woodcabinetsite.com/product-category/kitchen-cabinets/

Also, each single product displays its thumbnails in a gallery format (where they’re all stacked) – I’d like to figure out how to get those thumbnails to display in a carousel format, since each product has 5-10 gallery images.

https://www.woodcabinetsite.com/product/vanilla-maple/

I’ve tried looking into the product-thumbnails.php but can’t figure this out. Can anyone help?