You can edit your credit card information at Yahoo! Billing . You'll be asked to sign-in again to confirm your identity for this password<...

To edit your credit card information in your Yahoo! Wallet: Go to your Yahoo! Wallet and sign in with your Yahoo! ID and passwordMessenger 11.5 | Messenger 11 | Messenger 10 and earlier | Messenger for Mac

Avatars homepage. Then sign in and customize your avatar. Your changes will remain in effect until the next time you make a change.

If you think that someone is using your account to send SPIM to the contacts on your Messenger List, we recommend that you change your passwordMessenger 11.5 | Messenger 11 | Messenger 10 and earlier | Messenger for Mac | Messenger Mobile

Always remember to "Sign Out" at the end of your session. You should also periodically change your passwordMessenger 11.5 | Messenger 11 | Messenger 10 and earlier | Messenger for Mac

Click the Change your password link

This document describes how to reset id and password in Yahoo! Messenger.

To allow someone else to sign in to Yahoo! Messenger for Mac you'll need to remove your sign-in information and then have the new person enter their sign-in information: Click ChangeMessenger for Mac

Adjusting the Connection Preferences in Yahoo! Messenger for Mac will resolve this.