Hi,
First, please open a new topic when your question is not directly related to the topic.
In this case, I don't see the link with the invalid pinterest URLs and your customization question, so I took the liberty to move your question to a new thread.
Also, please provide more context.
I don't know which page you're talking about. The product page , the products listing, something else ?
It would be great to give the link of the page you're talking about. If you're creating a new topic, you have a field where you can put your URL and have it submitted with your thread while not visible by anyone else other than us, if you're concerned about it.
Now, on to your questions.
To know which view file to edit for a particular area, you can activate the "Display view files" setting of the Hikashop configuration. That will tell you, on any page of your website, which view files are being used. Then, you can edit them via the menu Display>Views.
I'm not sure what is the link between creating a custom field, and displaying the product title and not the product description ?
I assume that if you want to add extra information to your products, you'll want to create a custom field of the table "product", and the type would most likely be "text" or "text area", but I'm already making a lot of assumptions here as I don't have any ocntext of what you're trying to do.