Check at the beginning of the instructions. For something like that, all patterns that I have seen (in my short time) have a stitch guide. If I had to guess, I'd guess to slip 2 stitches onto a cable needle, hold them to the back, knit two, then k 2 off of cable needle. This will make a basic cable where the knit stitches on top will slant to the right (as facing you). I don't know, don't take my word for it! Patterns usually have these things at the beginning defined.