You worded this oddly, but I'll try to help.
The blind prophet (Tiresias) assists Odysseus in finding a way back to Ithaca, as he and his crew have been stranded with Circe all this time. He explains the problems the crew may encounter, although those problems don't actually come as a surprise, Odysseus and his crew have already been veered off course by Poseidon.
Unfortunately, since the Odyssey itself is a follow up to the Iliad, there isn't more background in it on HOW Odysseus upset the sea god, but it's essentially the cause of almost all of the crew's problems.
The theme itself is tricky, there's a lot of ways you can think about it, Odysseus can be thought of as dedicated to his family, but at the same time he slept with every woman he encountered on his way back from the war, But this situation gives the theme of Loyalty, Odysseus' only current thought is returning home, and the Prophet is getting him there, in a rather roundabout way, of course.
if you could explain in context I can help a bit more.