They did this by using a combination of prophecies, flattery, and trickery. The witches' prophecies played on Macbeth's hopes and ambitions, giving him hope that he would become king. Their flattery made him feel special and more confident in his abilities, despite his fears. Additionally, the witches used trickery and deceit to lead Macbeth astray, confusing and distracting him so that he made unwise choices. Through this manipulation, the witches had great influence over Macbeth's actions and led him on a destructive path.