To sign up for Yahoo!'s personalized services, just follow the instructions for new users on the sign-in page of any of Yahoo!'s personalized services.:-
1.click the link below:-http://edit.yahoo.com/config/eval_regist…
2. Fill up the required fields i.e. your name, Birthday, postal code, alternate Email, Security Question etc.
3. During registration, you'll be asked to choose a Yahoo! ID and pick a password. Remember it or notedown it on a page because it is used for sign in yahoo.
Note:- Your Yahoo! ID cannot contain special characters or spaces. After you've signed up, you can use this same ID and password for all of Yahoo!'s services.