How do I add signature to all outgoing messages? (Staff/Faculty)

To insert a signature automatically:-

1. On the Message tab, in the Include group, click Signature , and then click Signatures
2. Under Choose default signature, in the E-mail account list, click an email account with which you want to associate the signature.      
3. In the New messages list, select the signature that you want to include          
4. If you want a signature to be included when you reply to or forward messages, in the Replies/forwards list, select the signature. Otherwise, click (none).