Below is the code to remove them, however on that same line there is also the sku number of the product. So by removing just the category and tags, you will have an empty space
Please open Flashlight Theme Options > Styling and add the code below to Quick CSS on the bottom:
The code above will only make the categories/tags invisible.
To completely remove them out of the theme you would need to edit the file 'meta.php' located in the wp-content/plugins/woocommerce/templates/single-product/ .. However when you update the WooCommerce plugin you will need to do this over again since the file will be overwritten.
inside that file please remove the following two lines:
<?php echo $product->get_categories( ', ', ' <span class="posted_in">'.__('Category:', 'woocommerce').' ', '.</span>'); ?>
<?php echo $product->get_tags( ', ', ' <span class="tagged_as">'.__('Tags:', 'woocommerce').' ', '.</span>'); ?>