Knitting question

How does one slide stich wyib

I have trouble with slide stich wyib. Can anybody help me please.

Slip stitch with yarn in back is done by moving the yarn to the back between the needles and slipping the next stitch on the left needle to the right needle. When you slip the stitch, just pass it from the left to right needles by lining up the needles as if you were going to purl.

Slipping a stitch is just moving it from one needle to the other, sometimes as if you were going to purl it, sometimes as if you would knit it. Wyib means to keep the yarn in back and doesn’t have anything to do with slip knitwise or purlwise; that refers to how the R needle enters the stitch to slip it.