I just posted this on another topic.
I never could get the metal clips to work, but my stylist showed me an easier way. I just take two medium-sized claw clips -- about the size to fit comfortably around my thumb -- and clip them along my part. I just leave them in while I diffuse and then take them out. They do add volume at the top of my head, right where I need it, and they are simple to put in and remove.