New knitter

Working on a new blanket pattern. It says to K10, *[p2, yo, sl 1, k2tog, psso, yo] 6 times, p2, k5, rep from * to last 5 sts, k5

I am having trouble with the p2, yo. It seems I am adding to many stiches in my yarn over. Does the yarn go to the back before I do the slip stich?

I understand yo then k but yarn over purl, I am not getting it right.

HELP!

Hi and welcome to Knitting Help!
Ok, it’s the yo and then p2 at the repeat that’s causing the problem. Do the yo by bringing the yarn to the front between the needles and then over the right needle to the back and around again to the front so that you’re ready for the purl stitches. You’ll only have one loop over the needle from the yarn over.