[Plugin: WordPress Goodreads Bookshelf] Cannot figure out how to display this as a widget

Create a text widget (or a PHP widget — I don’t know how that plugin works) and populate it with this code:

<?php if(function_exists('bookshelf')) { bookshelf(); } ?>

Has anyone figured out where to put that code?

“Put the bookshelf function in your templates” – what?

I’ve simply placed the above code into a text widget and it worked fine. Note that you need to have also installed and activated a separate plugin to allow PHP code to be executed from the widget area. I recommend Exec-PHP.