Locate your blind stitch presser foot. Hint: if you can't find it, and you *just * had it, check to see if you used it as a book mark in your owner's manual. It may have taken me 30 minutes to find mine this way today. Maybe.
remove stitch finger, as with a rolled hem
Set your machine as follows (also use these settings for a narrow overlock stitch, fyi)
Stitch width and stitch length to "R" (or as small/narrow as they go)
All thread tensions set to 4
Mark the wrong side of your fabric where you want your pin tucks to be
fold fabric, wrong sides facing. Place under presser foot so that needle *just* hits on the fold. Adjust foot position guide using little screw thing to the folded edge