p 2 (seam sts)

child's fringe cape

Hi, I have just started on this cape but need help to carry on knitting as I don't understand
the meaning of seam sts.

Row 1:P7, inc one st in next st, place marker on needle, p 2(seam sts), marker, inc one st
in next row, p 4, inc one st in next st, marker, p2(seam sts), marker....

What do I do after p2 regarding the seam sts?

Would appreciate help with this. Thank you in advance.