Here is the pattern…
http://cache.lionbrand.com/patterns/70217A.html
I’m confused where it states…
Next Row (RS): K21 (22, 24, 26); 28 (29, 32, 35, 37, 40) sts, join 2nd ball of yarn and bind off center 10 (14, 16, 18); 22 (24, 26, 28, 32, 34) sts, k21 (22, 24, 26); 28 (29, 32, 35, 37, 40) sts. Working both sides at the same time with separate balls of yarn, bind off 2 sts at each neck edge once, then decrease 1 st at each neck edge every other row twice - 17 (18, 20, 22); 24 (25, 28, 31, 33, 36) sts for each shoulder. Work even until same length as Back to shoulder. Bind off.
What does the “join 2nd ball of yarn” mean? Am I supposed to be knitting w/ 2 strands at this point? And also the “working both sides at the same time with separate balls of yarn”.
This is my first sweater. I’ve made shrugs, but never a full blown sweater. This one looked easy but that spot is throwing me for a loop! Any help is super appreciated.