display product_sku on browse and product details pages

[ezynet]

I would like to display the product_sku on the browse and product details pages.  I have searched through these forums and all the variations i have found don't work for my installation of virtuemart.  I am using Joomla 3.4.5 with Virtuemart 3.0.12 and the template I am using is Protostar. Can someone please give me some clear instructions as to what code goes where and in what directory, document etc.  Thank you in advance.

[GJC Web Design]

on details-> components\com_virtuemart\views\category\tmpl\default.php

echo $this->product->product_sku;

on category products

components\com_virtuemart\sublayouts\products.php

echo $product->product_sku;

over ride both or do in your over rides if present

[ezynet]

thankyou so much