I have a Bernina and for a satin stitch I use foot #3, second choice #20. I feed my bobbin thread through the hole in the bobbin case. This makes the top stitch stand up nicely. I use a stablizer underneath (paper works too) and you will need to set your zigzag width and stitch length to match the size of your applique. Do a test sample to make sure everything works the way you want as zigzag is not easy to rip out. Good luck and hope you can understand my explanation.