The part I need help on is this
Drop loop from hook, but do not fasten off.
Foundation Row: From RS, join yarn with sl st in 5th (5th, 6th) ch-3 sp; ch 28 (30, 32) (for sleeve),
How dod you do that? What it sounds like is that you drop the loop and create a sl st in the 5th ch3 space but then...