NextGEN Flashviewer plugin – Postcardviewer

Hi,
i installed NextGEN Gallery plugin, then NextGEN Flashviewer to be able to use Postcardviewer. I created my gallery with NGG, then i made the general settings and postcardviewer settings in NGF, i put the following shortcode into a page : [pcviewer id="1" width="800" height="800" link=""] … so everything is clear… but can someone tell me what i should write as a link in the shortcode ???
If i put the gallery path which i got from NGG (wp-content/gallery/book), it does not work, the linjk is shown as a normal link text and additionally it does not take you anywhere…

The page i want to install the gallery : https://www.igorlaszlo.com/book-illustration/