Redirect

You can hardcode the link.
To do that you need to change the following code

extract(shortcode_atts(array(
                            'author' => '1',
                            'redirect_url' => get_permalink(),
                            ), $atts )
                );

to

extract(shortcode_atts(array(
                            'author' => '1',
                            'redirect_url' => YOUR DESIRED LINK
                            ), $atts )
                );

I will add an option page for this plugin in my next version where i will add an option to change redirect link.

Let me know if it works.