Where do I modify what is displayed on all product pages?

Please find here for the document guide on how to configure the theme: http://www.designwall.com/guide/dw-trendy/If you still face there issue, you can tell us know detail about the position that you want to modify.
Regards,

To resolve this issue, you can do as the following:
– Remove Price section:
you can add the following code to the style.css file:

.price { display: none; }

– Move the “Share this” section to below the Add to Cart button.
you can add the following code to the functions.php file:

remove_action( 'woocommerce_single_product_summary', 
               'woocommerce_template_single_sharing', 50 );
add_action( 'woocommerce_single_product_summary', 
            'woocommerce_template_single_sharing', 31 );

Then add the following code to the style.css file:

.dw-sharing { margin-top: 0px; }

– Remove “tags”, “categories”, “Availability”, and the quantity selector.
You can add the following code to the style.css file:

.availability { display: none; }
.product_meta { display: none; }

–  Our theme does not support to change the “Quick Overview” section as you want.
Regards,