Odysseus told his men only about the sirens, However, he didn't tell them about if they headed toward Charrybdis mostly they will all die, and if you head toward Scyliia at least six men will die. He didn't tell them because he thought if he didn't morale would be up and a better chance he wouldn't
"Plug your Oarsmen's ears with beeswax kneaded soft"
Odysseus told his men to tie him up so he would be able to go in the water with sirens
Let me out, I'm okay
Odysseus thinks "But as I sent them on toward Scylla. I told them nothin', as they could do nothing." So they continue on their path.
The way they were sailing and needed to sail, was so that Charybdis was on the left and Scylla was on the right
"I tied on my cuirass and took up heavy supers, then made my way along to the foredeck- thinking to see her first from there,' and" I strained my eyes upon that cliffside veiled in cloud, but now where could I catch sight of her
I can't see her any where, where is Scylla
"Then Scylla made her strike, whisking six of my best men from the ship. I happened to glance at ship and oarsmen and caught sight of their arms and legs, dangling high overhead. Voices came down to me in anguish, calling my name for the last time"