Loosely knit 2 stitches on to the right hand needle. The purl stitch can be used here if required for the pattern.
Place the tip of the needle in your left hand catch the loop of the back stitch,and carefully pull it over the top of the stitch in front of it, and dropping it off the needle.
This will leave just one stitch (one that was of left) on the right hand needle.
Loosely knit or purl another stitch onto the right hand needle.
Again use the left hand needle catch the loop of the back stitch and pull it over the top of the first stitch and drop from the needle.