To create a new signature in Outlook 2013, you open the File menu and Options, select Mail, then Signatures. You give the new signature a name and enter the text. Formatting can be applied and it is saved. Now when composing emails, the signature is automatically added to the body from the options selected.

1. How to create a
new signature in
outlook 2013

2. If you sign your emails the same way most of the time, you can create
signatures in Outlook that you can attach to your emails.
Easily create a signature for business emails and a
different one for personal emails.

3. To create a new signature :
open Outlook and click the File tab

4.  Click Options in the menu list on the left side of the Account
Information screen.

5.  On the Outlook Options dialog box, click Mail in the list of
options on the left side of the dialog box.

6.  On the Mail screen, click Signatures in the Compose
messages section

7.  Click New under the Select signature to edit box on the
Signatures and Stationery dialog box.

8.  A dialog box displays asking for a name for this signature. Enter a
descriptive name in the edit box and click OK.

9. You are returned to the
Signatures and Stationery
dialog box and the name
you entered displays in
the Select signature to
edit box. If it’s the only
signature, it will be
automatically selected.
Enter the text for your
signature in the Edit
signature box. Select the
text and apply font, size,
and other character and
paragraph formatting as
desired. Click OK to
accept your changes and
close the dialog box.

10.  Click OK on the Outlook Options dialog box to close it.

11.  Now, when you create a new email message, the default signature is
added to the body of your email automatically. If you only have one
signature set up, that will be the default signature.

12. Thank For Your Attention
Reference : http://www.howtogeek.com/173548/how-to-create-a-new-signature-in-outlook-2013/