Three tams decrease help

hey guys, been awhile but I’m still knitting

I’m working on Tam A from Knitty, and I just got to the first decrease. After I slip the first two stitches, I don’t know which yarn to knit the third stitch with. I thought it should be white, but if it is then it sort of screws up the rest of the line by moving it over one stitch. But in the picture of the finished hat, all of the decreases are white. Can anyone help me out?

It looks to me like you are going to slip two white stitches, knit a pink and slip the white stitches over the pink.