Casting on to either side of knitting?
I'm trying to make a baby "devil hat" (really cute, with horns and "devil tail ends"). It has earflaps with two i-cords to tie the hat on, but it requires that I cast on an extra stich on either side of the i-cord to make 5 stitches (the i-cord flares out into the "devil tail ends"). I cannot figure out how to do this and then knit into it.
When I go to knit into the stitch it comes right off the needle. Also, to cast on to both ends requires me to run the yarn across the i-cord, if I'm not mistaken. I am fairly new to knitting, though I've made several projects with web video help. So maybe I'm just doing something wrong. Should I keep trying the extra cast on, or should I use some kind of increase?
And could someone tell me how to correctly do this?