Also on these boards
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.
To keep track of your rows, move paper clip as you finish each row. Use a thick enough piece of card that the clip doesn't slip. I often write an abbreviated version of the pattern repeat on a card; in that case, the numbers will be on the left, and you can use this same trick.