You could also make your OWN signatures in's a sample of 72 dpi..and the 118 for web sizing..
make the image 300x100 or 300x200..whatever works for you..

Then go to tab on your page..SAVE IMAGE PNG..not jpg.. CHECK transparent background..
and browse and name item and location...Then take image and send to photobucket or the like...and select IMG link, then open MAX...go to settings..EDIT SIGNATURE.. RIGHT click in Box and PASTE the image in the box..

I pump up the effects..advanced..just a hair at a time..helps

72 dpi with nothing done to it..

118..dpi and a little brightness added

dropshadow added

Something to think about! Be all you can be on MAX!!