Follow the steps to change signature in Windows Live Mail account:

• Click ‘Windows Live Mail’ button.

• Choose Option | Mail from the menu that appears.

• Go to ‘Signatures’ tab.

• Ensure that ‘Add signature to all outgoing messages’ option is selected.

• Also deselect ‘Don’t add signatures to Replies and Forwards.’

• Now edit the signature that you already see in the signature message box.

• Click ‘OK.’

If things don’t work out the way you want, contact Windows Live Mail Support Number.