What is the ruling on advertising products aimed at youth on MBC FM radio?

It is not permissible for a Muslim to advertise on a radio station that promotes immorality and debauchery, even if the advertisement is for something permissible. This is because it attracts people to follow it and supports its continuation, and it involves cooperation in sin and aggression, which Allah has forbidden in His saying: "And cooperate in righteousness and piety, but do not cooperate in sin and aggression."