I went back in the thread and found that the displayed link had been shortened, you needs the actual link. The give away is the three periods in a row. The link address which you enter preceded by http:// is:

gpx.geotags.com/cgi-bin/gpx.cgi?saddr=%s&daddr=%s

I removed the http:// so the forum woudn't truncate what you see as a long link.