Hello Lisa,
Either you do not have enough pressure on the foot for the machine to feed through, or you do not have your stitch length set properly, have you made sure that the teeth are coming up above the throat plate when you check without the material in ? make sure you have not lowered the teeth by mistake.
e-mail if you like, drivewithken@blueyonder.co.uk
Ken Dourof, April 2007