Have you attached the walking foot correctly? The little arm has to go around your needle bar or rest on top (Janome). If that isn't happening the walking foot doesn't engage. Do you have the correct walking foot for your machine? Not all generic walking feet will work on every machine (Husqvarna & Bernina only take their own). Lastly the walking foot could be defective (I had one that just wouldn't work). Hope you get this figured out soon.