according to graph.
FINISHING:
RND 1: With Williamsburg yarn, join in and st on outer edge of afghan, ch-1, even work sc around afghan and working (2 sc, ch-2, 2 sc) in each corner, sl st top beg sc, ch-3, turn.
RND 2: Dc ea st around working (2 dc, ch-2, 2 dc) in each corner, sl st top beg ch-3, fasten off.