If possible copy an old signature to paste for the new signature.
1. Start new email 2. Click on signature>signatures 3. Click New 4. Name new signature 5. copy & paste from old signature / create new signature 6. insert logo (icon to the right of business card icon) 7. Choose default signature for email account, New messages, Replies/Forward
8. click Ok to save settings. 9. Close all email 10. Create new email & you will now see new the signature