How do I sign out from my Yahoo mail and go directly to my personalized My Yahoo page?

You can't do that. Your MyYahoo page is personalized and can only be accessed when you are signed in. Instead of signing out of mail click the "MyYahoo" link at the top, middle-right side of the mail window. It should be right next to a little yahoo web search area. That will keep you signed in and take you to the MyYahoo page. When you are done with that then sign out. There's a link for that too on the right side of your page above your columns. It should have your name/nickname, the sign out link, tips and help links. I make it easy for myself and I have "MyYahoo" as my homepage. But I'm on a personal/non-shared computer. I also select "keep me signed in for 2 weeks" as well. That way I don't have to do it over and over every time I access my homepage. Good Luck!

You don't need to anymore, since you signed up with googlemail and found the service much more to your liking.