In order for you to talk to Teiresias you must present the sacrifice of a black lamb.
"Then I addressed the blurred and breathless dead, vowing to slaughter my best heifer for them before she calved, at home in Ithaca, and burn the choice bits on the altar fire; as for Teiresias, I swore to sacrifice a black lamb, handsomest of all our flock."
"Stand clear, put up your sword; let me but taste of blood, I shall speak true"
Poseidon wishes to make your track home more difficult than it should be. He will put obstacles in your way because you blinded his son. You will lose your crew and ship, and even when you get home there shall be trouble.
"Then a seaborn death soft as this hand of mist will come upon you when you are wearied out with rich old age, your countryfolk in blessed peace around you. And all this shall be just as I foretell"