I'm not sure about the slip stitch either. :thinking: Isn't that a crochet term? Maybe you use a crochet hook? I haven't looked into it too much yet, but I imagine just sewing it down with a tapestry needle could work!
"I will remember that no one has ever been killed or maimed by being adventurous with knitting, no matter how pointy the needles." The Yarn Harlot