Hi everybody a fiend gave me a piccolo and I was playing it (like a flute) but I don't know how do play the first C in the first scale, I tried to press all the keys as I do on my flute but I never heard my C... so please tell me which finger or key do I have to press.... thanks!

There is no low C on a piccolo.

I'll start with this: The theory is simple, but the keywork complex.
For a Picc to have low C, it's body would have to be longer and a tone whole added that could then be covered by a key.
The key after D on the common day Picc is the Eb key. If I am not mistaking, there are Piccs with low C but they are rare still. At any rate, nothing below a D is ever written as those notes are *for the most part* non-existent.