Are you attaching it all along the top or just for the handles? If it's all the way around, I imagine you just sew it on. If it's for handles, I've read that using fishing line or tough nylon thread is good--invisible yet strong.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
There is a way to knit the ICord onto a project, but for the life of me, I can't remember where I found the tutorial for it! All I remember is that I typed in "Attach ICord" in a google and it came up with a great one. I used it on a belt and it looks SO good!