Get the car up on a rack or some jack stands and get under it.  You
should see two plugs in hte side of the transmission.  The one at the
bottom of the tranny is the drain plug, the upper one is the fill
plug.  Take our the fill plug and stick your finger into the hole.  if
you can feel fluid or have some on your fingertip when you pull it
out, the fluid level is ok.  If not, fill the tranny until the fluid
is to the bottom of the fill hole.

Tom S