If you are looking for create yahoo email account then you need to know complete information about yahoo mail. Here is mentioned blog help you to know the full details of this service before creating account. So, let's started few steps: -
You will see Sign in button on your upper right and click on it
You can see create an account button below the next button click on it
You will see first and last name, email address, password, mobile number, date of birth and gender fields. Need to fill up complete info and then click on continue button.
In the next window, click on text me a code and then enter verification code that you receive on your mobile number click on submit button.
Now, your yahoo account has been created.
Also read this - How Do I Create a free Yahoo Email Account?