thats fuckken to big.. for a sig..
shorten it, most GOOD sigs dont go over 500 px and sigs are mostly wide rectangles unless horizontal sigs, square sigs are well gay.
i still don't know what you are trying to do?
try uploading the pic to TinyPic - Free Image Hosting, Photo Sharing & Video Hosting
and use [img] code for forums and boards, instead of uploading it to MPGH