This video knitting tutorial will help you knit the knit one purl one knit one double increase (k1, p1, k1). This technique is mostly used to help form bobbles and add texture to your knits. It is almost always used in conduction with another stitch.
Abbreviation: (k1, p1, k1) into next stitch
Step 1: Insert your working needle into the next stitch and knit one stitch, but leave it on the main needle.
Step 2: Bring the working yarn to the front and purl into the same stitch, but leave it on the main needle.
Step 3: Bring the working yarn to the back and knit into the same stitch, this time pulling it off the main needle.