[working in front loops only, slip st in next
st, ch 7, slip st in next st, ch 5] 6 times, slip
st in next st, working in both loops
Is it the front loops only part you're having trouble with?
Crochet In the Front or Back Loops of a Stitch
or sl st?
Learn to Crochet: Making a slip stitch (abbreviated sl st)
Or is it something else?