I dunno why it won't work for me, it works for me over on DVDswap.

Go to ISBN page for the book, right click to copy the blue link to book title,  go to WL Multiples and paste it?

Does not work for me, though this is how I do it over at DVD swap?

Help!

Laura, go to the ISBN page for the book, and at the top of your browser, highlight and copy the URL/webpage address.

Then go to the discussion topic Reply box, type in your text.  Highlight the text you want to be linked (it may be the title of the book, or the ISBN). 

Then click on the left chain icon (Link icon) found in the editing toolbar at the top of the reply box.  A dialogue box will pop up - paste the URL that you copied in the space provided, then click OK.

That should then make the text you highlighted into a clickable link taking you to the book details.