What did Circe tell Odysseus he must do in order to return home?

Circe instructed Odysseus to journey to the Underworld to seek the prophet Tiresias, who would provide him with guidance on how to return home to Ithaca. She warned him about the dangers he would face along the way, including the Sirens, Scylla, and Charybdis, and advised him to sacrifice to Poseidon to appease the god and ensure a safe voyage. Additionally, she emphasized the importance of not harming the cattle of the Sun God, HeliOS, during his journey.