How-To: Safely Rip Back Knitting Stitches Once you have your needle inserted all the way along the row, you can pull the working yarn to rip back the rows above the needle. The stitches will be sitting on your needle ready to go.
Knitting Tutorial - Matress Stitch worked horizontally to join two pieces of knitting. The stitches are in contrasting color to show detail, but it might be fun to do this and add some embroidery for embellished seams on a sweater. from Knitting Daily