How to turn off and turn on SKUs?

All I have to go off of is this: https://www.skyverge.com/blog/how-to-hide-sku-woocommerce-product-pages/

And I believe the developer added the snippet of code somewhere but I can't find it anywhere to delete it! 

The customer now wants to add the SKUs but I don't know where to delete that code she put in. Thanks!

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