Adding "Nofollow" to ClassicBookmarks links

Hi

Please can someone tell me how do I add “Nofollow” rel tag to the 6 or so links that we get from the ClassicBookmarks button..

These are FB, LinkedIn, Pinterest etc…these are links and I want to add the Rel=”nofollow” tag.

This is not the SexyBookmarks but the ClassicBookmarks.

Thanks for your help.

http://wordpress.org/extend/plugins/sexybookmarks/