Work your pattern until you reach the stitch where you want to increase.
Step 1: Insert your main needle into the strand in-between the stitches where you want to increase, going from front to back.
Step 2: Insert your working needle through the back loop of the strand on your main needle.
Step 3: Knit the stitch.
Step 4: Pull the stitch of the main needle.
Repeat this sequence once more using the same strand.
music in video is from demo 2008 by (Latchxe9 Swing) / CC BY-NC-SA 2.0