Okay, the 'key' to the symbols is right there above the schematic. You read the first row starting at the bottom right across to the left, the even rows are just purl on the WS. The text says to do M1A on 3 sts, repeat the B section for whatver stitches, and the C secion is 7 sts. So here's the pattern for M.1
A - k3
B - k1 yo, k3tog, yo,
C -k1, yo, k3tog, yo, k1, k2tog
k3 to start, repeat the B section until you have 7 sts left, then do C.