My machine has a button on the back to drop the feed dog. What kind of machine do you have? Do you have a manual with it? Check in there to see if they have a section on it? It mite be located underneat the throat plate. If not try the tape, but I suggest using wide scoth tape, It is slicker then masking tape and therefore easier to slide around your fabric for stippling, As to where masking tape has a rougher top texture making it more of a strain to move your fabric around.I personaly have never stippled with the feed dog up. Let me know how it goes.