All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
If the advertisements posted on that website are lawful, then there is no blame if you take money for promoting them; otherwise, you should not promote them since this includes some sort of cooperation in sin – a matter prohibited by Allah, the Exalted, as He Almighty says (what means): {And cooperate in righteousness and piety, but do not cooperate in sin and aggression.} [Quran, 5:2]
As long as it is not allowed to post such advertisements, you are not allowed to earn money for promoting them, since it is earned through forbidden means.
Allah knows best.