When you have created a mail ID, you would have certainly given an alternative email address, and you would also have answered a few security questions. If you remember these answers, stay away from worry. You need to answer these questions or else provide the alternative email address, and you would be let to change the password now. But, what if you had forgotten these too? Such things can always happen. You can always call Yahoo technical support. The sign up issues page lets you to Yahoo mail reset password options and you can see the changes happening by step by step instructions.