In the game of Yin and Yang Master, if you want to borrow a friend's style, you must first become "relatives and friends" with your friends, that is, your intimacy with your friends reaches 150. This can be confirmed by clicking the "Friends" button in the scroll bar, and the friends interface will appear.
After meeting this condition, click the "Cooperate with War" button on the right, and you can choose the style god of the friend you want to borrow.
Please note that each friend can only borrow it once, and the cooperative god can only be used in the "type god challenge" game.