the easiest way is to connect it to pin 4 and 6 on the GPIO.
Pin four is the second red pin called "+5v Power" and pin 6 is the black called "ground". Pin numer 1 on the board is the pin next to the small arrow.
Thank you very much, it works. The fan is noisy, if I put it on the ground + 3.3v is not much, but hardly draws air. And I do not know if it would be detrimental to the fan.
Another option is to check if there is a silent fan