Here are my directions. I orderd my scarves from dharmatrading.com
Iron your scarves so they are flat (you can wash them in woolite and line dry them first if you wish)
Stamp the scarves using a permanent ink. I used Stampin' Up! Craft ink (classic ink won't work because it is washable).
Let the ink dry and then heat set it. I ironed my scarves between 2 towels. I also put them in the drier on low heat for about 20 minutes. You may not have to do the drier step, but I figured it can't hurt.