Hooded Vest Back Neckline

Being new to crochet I’m not sure if I’m doing this correctly.
I’m making a hooded vest and on the back piece for the neck it states to:

"Now there are only 2 rows left until finish.
Crochet 1 row with only 7 dc groups each side, on the next row crochet only over the 6 outer most dc groups (i.e do not crochet over the mid 3-4-5-5-6 dc groups = neckline)."

Here's the actual pattern:

I understand what they want me to do, I’m just not sure how.
Do I use a slip stitch for the back of the neck to cross to the other shoulder?