How to change my yahoo mail to the new style of the mail ?

No you don't have to change to the new mail! I did and I really wish I had not! its nothing more than another problem. You should be able to open your mail from almost any location as long as you have the correct email Addy and p word.you don't have to change your account either. if you really want to change to the new mail at yahoo just click on the menu bar on "my yahoo" there will be an area on the top of the page that will say something switch to the new yahoo... it will be in the upper left top of the page