This works for version 2.0 … no guarantees for future or previous versions : )
Upon generation of a button or whatever optimize press item with a link you want to set as NOFOLLOW… do this
for the url… enter
http://theurl.com“ rel=”nofollow
what you are doing is adding the closing quote ” a space and rel=”nofollow” to force OP to generate what you want IN the shortcode
and optimize press will generate it as
href=”http://theurl.com%22%20rel=%22nofollow” in the shortcode
to adjust EXISTING shortcodes already generated in posts/apges add this to the end before the ” (endquote) of your existing url and then check it in your source generated
%22%20rel=%22nofollow
This keeps your linkjuice flowing in the right directions for silo’d sites