Question

how to sign in the yahoo messenger when the user is not having an existing account ​

Answer 1

Then you have to login

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Answer 2

Answer:

The user needs to sign up and create a new account in this case.

First, go to Yahoo.com using any browser and click on 'Mail' at the top of the page.

Next, the sign-in option will appear but since the user doesn't have any existing account, he needs to create a account providing all his personal details like name, date of birth, and also choose id and password subsequently.

After the account is created, one can access the Yahoo messenger using the id and password given.