How do I get Yahoo to be my default email address?

I've already downloaded the program to make it my default email program, but in IE, under Tools, Options, my email options are Outlook Express and Hotmail, neither of which I use.
How do I get Yahoo to be my default email address?
Press - all at the same time:





ALT - F4
Reply:of you internet explorer, click on tools then select internet options. on the general tab. type www.mail.yahoo.com on the address box