There's a girl manipulating my friend Soo I want to learn how to manipulate her

I understand that you're concerned about your friend and want to help him, but manipulating someone is not a healthy or constructive approach. Instead, consider encouraging open communication between your friend and the girl. Help your friend understand his feelings and the situation, and support him in making informed decisions about his relationships. It's important to promote kindness and respect in all interactions. If your friend is being negatively affected, you might also suggest he seek support from trusted individuals or professionals who can provide guidance.