The twist stitch is k2tog, leave on needle (instead of slipping off like normal) then knit into the first stitch only. That makes the twist and you're done with those 2 sts.
I don't care for this method of doing a twist stitch, it's not as defined as if you knit into the second stitch first (from the front of your work) then into the first stitch. A RT may be a little easier to do the ktog/k, but the other way gets easier with practice. Try this both ways and see which you prefer.
sue- knitting heretic