Sasuke was saying "Burn it down" to the Juubi. He used genjutsu in the previous page, to take over him, and now he has the Juubi under his control. When Sasuke says "Burn it down", he's ordering him to burn the wood chains down and set himself free.
He wants to be the Jinchuriki of the Juubi
He wants to be the Jinchuriki of the Juubi