Answer:
This actually starts on C, which is do.
I would open an online piano and play the notes so you can sing with it.
Here are the note names on your screen in order:
C, D, E, G, F, E, F, E, E, F, G, A, G, E, G, C.
Do - C
Re - D
Mi - E
Fa - F
Sol - G
La - A
Ti - B
Do - C
