It is difficult to understand.
Anyway, I assume you mean you meant you want a custom field in your products (not "articles") to link to a specific page in your site.
Well, that's simple. Back to basics: how do you create links in HTML? Correct, just like this:
<a href="path/to/your/page">Brocklede</a>
So then, make a custom field of the type "Text", and in the product edition page insert the code in the fashion here above. Guess what will appear in the frontend on the product page? Yes, this:
Brocklede