Help! I am making a throw which starts out on the diagonal, increases in the middle and then decreases. The instructions read knit 24 rows stockinette then "cast on 12 stitches at the beginning of the next row, knit to end of row." Cast on 12 (more) stitches, knit 12, purl 12, knit 12. I am totally lost. I have no idea how to cast on after the project has started. I know how to increase, but the instructions specifically say "cast on." I've tried increasing, and tried to figure out how to cast on without starting with a slip knot, but it's not working. I've been out of the loop for about 20 years and just started again.