Every knitter has dropped a stitch before. It can be frustrating especially if you don't catch it right away. There is a way to remedy the drop stitch and the ladder of jogs it leaves behind.
You will need a handy dandy crochet hook. I keep one in my knitting bag for just such occasions.
1. Insert the crochet hook in to the drop stitch.
2. Slide the crochet hook under your first jog.
3. Pull the crochet hook down catching the jog and pulling it through the dropped stitch.
repeat steps 2 and 3 until all the jogs have been restored to stitches and your drop stitch is at the top of the work. Slip the stitch back on the needle and continue knitting.