Hello, I have a promotion available in my cdf. When I press promotion nothing happens. I can't find how to promote a young person. Could someone tell me how to do this?

he has to be at least 17 years old, he's probably younger, that's why!

The player must have 100% in the cdf

And you have to click on the player, not on the button at the top of the cdf with "promotion"
once on the player at the bottom appears a button to promote

Thanks for the information, I did try to get it out before the 100%

So if that's not what you're doing already, think about scheduling friendly matches as often as you can so that the % rises more quickly (1 match a day except on a CDF championship day)
and futsal also goes up (more slowly, but a little)