First of all, welcome to the forum!
Okay, now onto business...
The pinhole increase doesn't have different "right" and "left" versions. Just knit (or purl if you are on the purl side) into the horizontal strand between the last st and next st. If you go to Amy's page on increases (see dplantlady's link above), look at the video for "decorative increase."
Explanation: The pinhole (aka decorative, aka running thread depending on the book you look at) increase creates a hole -- twisted versions attempt to close the hole, making the increase less obvious. Depending on which way you twist the strand, you will end up with either a right or left slanting stitch. When the goal is symmetrical increases, this means that you'll have to take care to do one kind on right side and the opposite one on the left side. For the pinhole increase, this isn't a problem because you leave the hole there, without trying to close it up. For your reference, the twisted versions are usually called M1R and M1L.