Originally Posted by theducks
in the Metadata edit comments view there is a Tab to switch to HTML(code view). once the URL is there, it is click-able in the normal 'Book Details'
No need to write any HTML as such
The comments editor has an Insert Link
button that pops up a dialogue box with fields for the URI and Name.
I posted this because I've seen two "have a look here" references to the thread, so it seemed useful to clarify this item.