This video knitting tutorial will help you learn how to carry yarn up the side of you work. This technique is often used in colorwork, especially for stripes, and allows you to continue using a single strand of the same color yarn while working your pattern, instead of cutting and weaving in ends for each color change.
There are no steps for this technique. When you knit the first row of your contrasting color (CC), you will want to wrap your CC around the working yarn of the main color (MC). That way it will be secured in the stitch. Repeat until you ware ready to switch back to your MC.