To play D on the recorder, you put 6 fingers on your recorder; 3 left fingers, and 3 right.
b b d a bb a d
your right hand
G b a d
O o o<--- d note o
play a low d without your pointer finger
By singing to the recorder
You can't. They notes you play on the recorder are, a, b, c, d, e, f, and g. And all the sharps and flats in between.
Put your fingers over the holes :)
low d high f
You put your middle finger on the second hole from the top and hold your thumb as you usually would, on the back of the recorder, the B note.
you cover the back hole and the first two. :D
D ggg a bbb b a