There isn't a video for unknitting (tinking) along one row. :( However, I'll try to explain the best I can.
Hold your work as you would if you were continuing to knit the row. Take your left needle and insert it into the first stitch on the right needle, however go into the second stitch down (not the loop on the needle, the stitch just below that). Insert from front to back. Slip the loop off the right needle and gently pull it out of the stitch which is now on your left needle. Continue along back to where you first made the mistake.