Drutex and mimetex

Good morning,
I Drutex installation on my Drupal, and I do not know Configure the comment when I strip $1+1$ and I check "drutex" and i send my article I have error: "TeX Embedding failed! " I also installed Mimetex that works perfectly the link is like this: http://mywebsite.com/cgi-bin/mimetex.cgi?fonction
I want to use this privilege with Drutex! I mean when I strip $ 1+1 $ link it transforms the image en: http://mywebsite.com/cgi-bin/mimetex.cgi?1+1

thenks