PM is a personal message. Kinda like an email to just that one person. You click on the person's name above their pic or avatar, and some choices come up. One of the choices is PM. Click on that and you have a free screen to type, then hit send.
FMQ is free motion quilting. A type of meandering stitching, unlike STD (stitch in the ditch) or echo quilting. I believe if you search at the top of the home page, and type in abbreviations, you will find many more explained. Good luck. Don't be shy about PM'ing me if you have other questions. When I teach, I always remind students, "there are not dumb questions". If you don't know the answer, then asking is a smart question! Hope this helps. Penny (pgthom in Kalamazoo, MI)