I'm knitting a Moxie raglan sweater, pattern by c2knits.com. I tried to get on the webb page but couldn't. I'm at the part where you join the ribbing to the sweater.Ribbing section

ick up stitches by picking up 3 stitches for every four rows. I have ripped this sweater out twice when I got to this part. I guess I don't know what they mean? Help please!