The knitting needle in my right hand does all the work so I call it the working needle. The knitting needle in my left hand simply carries the stitches so I call it the carrier.
1. Put the tip of the working needle through the centre of the old stitch.
2. Wrap the yarn around the working needle.
3. Pull the yarn through the old stitch. Then pull the stitch off the carrier needle. Eventually all the stitches will be transferred from the carrier needle onto the working needle as the working needle becomes the carrier and the carrier becomes the working needle.