Yahoo provides e-mail service with three different domain names: yahoo, ymail and rocketmail. You can create an e-mail account as email@example.com or firstname.lastname@example.org or email@example.com. Yahoo owns all the three domains and you will get the same services. One of the most notable features offered by Yahoo is free Web-based e-mail, and you can create an account on all three domains with the same ID if the ID is available.
Launch an Internet browser and navigate to the Yahoo home page (See Resources).
Click the "Sign Up" link and fill out the registration form.
Enter your name, gender, birth date, country and postcode.
Type in an ID and choose "rocketmail.com" from the drop-down menu next to the ID field.
Type in a password and retype the password to confirm it.
Choose two security questions from the drop-down menu and provide an answer for both.
Type in the security code and click "Create My Account."
When you want to go to your e-mail account, type “www.rocketmail.com” in the address bar and then press “Enter.”
Type your full rocketmail e-mail address in the Yahoo ID box. Make sure you add the "@rocketmail.com" or it will not find your account.
Type in your password and click the "Sign In" button.