The final step to finish a quilt is to add binding around the outer edges. If you have not already sewn the binding strips together to form one long stripe, do so, and press the seams open. If desired you can fold and press the binding lengthwise by bringing the outer edges to the middle (wrong sides together) and then folding it in half again. Some find that this makes the binding easier to work with.
Once the binding is ready, trim excess backing and batting material to be even with the edges of the quilt top. Fold over the end of the binding strip about a ¼ inch matching wrong sides together. Then match the right side of the binding with the right side of the quilt and sew the binding to the quilt beginning in the middle of the bottom.
When you reach a corner, sew to ¼ inch from the edge, backstitch a few stitches and then cut the threads and remove the quilt from the machine. Fold the binding at a 45 degree angle from the direction you were sewing as shown at near right. Now fold the binding back on itself and sew ¼ inch from the edge, as shown at far right.
Continue in this manner until you arrive back at the beginning. Overlap the binding for an inch or so, backstitch, cut threads and remove from machine.
Next fold the binding to the back of the quilt and fold the raw edge under. Slip-stitch the edge of the binding to the back of the quilt with small stitches to enclose raw edges.
The final step in finishing your quilt is to wash it with cold water on the gentle cycle and tumble dry it on low. While washing and machine drying may not be recommended for some quilts, if you are making this one for a teen, it will need to be laundered regularly. You may as well wash it and make sure it is ready for use.