I had to buy the Stitch in the Ditch foot separate from the machine. Are you using the 1/4 inch seam foot that comes with the machine? There are 2, 1.) that is the 1/4 in. foot and 2.) the 1/4 in. foot with the Straight Stitch Plate for AcuFeed.
Here is a video
www.janomespecials.com/mc11kse/video/ditch-quilting-ditch.html