Hello Rosemary,
I am trying to remember the CF, I know the CS and if the machine is sewing in reverse it may be a simple thing such as the stitch length lever pushed to the top, failing that you will need to get into the top of the machine, if the top does not come off, on the back of the machine there should be a big plate that you need to take off, you will then see a large part that looks like a two pronged fork that has a cam inside it, you need to slacken the screw on the cam and move it slightly either way until you get a forward stitch.
drivewithken, October 2009