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Hi there and welcome
Can you tell me how you access your Yahoo account? Is it via your Internet Browser or via an email program such as outlook 2016?
Please let me know
Sign into Yahoo, then click on the Gear wheel in the top right then Settings
Then Click on Accounts
Click Add a New Mailbox
Add back the account you wish to use as the from address
Once added you can select it again
Let me know how you go please
ok, go to https://payments.mail.yahoo.com/
Click Change by the current payment method.
Select an existing card or click Add new card to enter your card info.