First thing is what kind of machine are you sewing on? On Pfaff's there is a middle spot for the lever that lowers and raises your foot. You need to use the middle spot for FMQ. You probably received a darning foot with your machine which is basically the same as the FMQ foot. That is the foot you need to use. Lower your feeddogs and put your upper tension to 0.
If you aren't using a Pfaff....read in your manual how to set your machine up for darning...it's the same process.
Oops just read you have a Janome....and you say you didn't get a darning foot...here is a picture of one for you:
http://content.janome.com/index.cfm/...Foot_Open_Toe_(for_low_shank_top_load_models)
Also here is another site to show you how to use a FMQ foot:
http://content.janome.com/index.cfm/...Quilt_Foot_Set,_Convertible_(High_Shank)
You can scroll down on this page and it tells you how to use the foot.
I am not familiar with Janomes and hope this help you some.