i use a darning foot all the time and on my sewing machine the button to lower my feed dogs is under the sewing machine to get to it i slide the part off that makes it so you can sew pants omg i went blank and cant think you know that when you slide it off the little storage part goes with it anyhow the button is on the back under some of the machine
gosh i hope you can figure out where i am talking !!!!! i tried