I am trying to set. I am trying to set up outlook using Yahoo as I've changed laptops from windows

Question

I am trying to set up outlook using Yahoo as I've changed laptops from windows 2000 to XPI've been trying all sorts of ways in more settings but each time I get not able to find outgoing server.I've tried smpt default of 25 plus 456 and neither seem to work. I've tried clicking and unclicking the check box about server authentication. I've tried well seemingly every which way but still no joy!Please help! I'm sure it's blindingly obvious but not being a computer expert in any shape or form I can't seem to find it. Many thanks