add rel=nofollow to comment & trackback

I want to nofollow the comments & trackback URL for the submit it plugin. The code is below. What 2 spots would I put in the nofollow code?

My site:

http://www.hilaryshepherd.com/rantsnraves/2007/12/29/penn-divorce-kidman-pregnant/

comments_rss_link(__(‘<br>RSS feed for comments on this post’));

if ( pings_open() ) :
$output = ”  |  TrackBack URI for this post\n”;