So when working with stripes, there is no need to cut the yarn every time you change colour. When you reach the point you want to change simply take the colour you want to change to, and twist it around the colour you are currently working in.

Now start working with the new yarn colour, pulling both yarns tight.

Every time you want to change colour use this method to avoid long yarn loops up the side of the knitting! It is useful to work in even rows of stripes so you always carry the yarn up the same side.