reading pattern help!!!

I have a pattern for a "throw".
with A ch 5;join w/ slip st to form ring (got that one figured out)
rnd 1: Ch 3, 15 dc in ring; join with a slip st to top of ch-3 (HUH?!)
rnd 2: Ch 1, sc in same st as joining, ch 7, skip next dc, [sc in next dc, ch7, skip next dc] 7 times; join in first dc. Fasten off

and so on and so on. I have no clue and haven't been able to find anything online that spells it out in simple language for me.
Thanks for your time and answers in advance!