1. Compose a New Email.
2. Select Signature and then Signatures…
This will open the Signatures and Stationery window.
If you are using the Simplified Ribbon, select the Signature icon and then Signatures…
You can switch between the Classic and Simplified Ribbons by select the arrow icon, 
3. In the Signatures and Stationery window, select New.
4. Give the signature a name and select OK (I.E.: new_emails, reply_emails).
5. Create and edit the signature in the space below. You can also create your signature in a Word document, and then Copy and Paste it in this area.
6. Select the Save button when done.
To make any edits to a signature, select the signature’s name. Then made the edits in the section below. Remember to select Save.
7. After creating a signature, you can have the signature automatically be applied to new emails or replies/forwards by assigning it.
You can also manually select which signature to use when creating a new email. Select Signature and then select a signature.