Explanation!
Hi, Could someone please help me understand these instructions?
Buttonhole row (WS) [P to marker, SSP, yo twice, p2tog] 6 times, p to end.
Next row Knit (working into back loop of each yo) p 1 row. With B (that is a color), k 1 row.
Now, I 'm confused as to "yo twice" and I don't know how to work into back loop of each yo. Also, I had to pick up 253 sts. Which I did quite nicely...however, I now have acquired 270!! I have already ripped out to the picked up stitches...don't really want to do it again, but looks like I will have to....Thanks to all who take the time to explain in kindergarten terms for me...

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Thank you! Linda