Hi Liz,

To have a signature added automatically to new email messages and replies and forwards, you must have a default signature assigned in each email account.

Since you have not mentioned which email service provider you are using, I am considering some commonly used service providers such as Outlook and Gmail.

Default Signature in Outlook 2013

1. To assign a default signature, open Outlook and click the File tab.


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


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


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

5. To change the default signature for an email account, select the account from the E-mail account drop-down list on the top, right side of the dialog box under Choose default signature.
Then, select the signature you want to use by default for New messages and for Replies/forwards from the other two drop-down lists. Click OK to accept your changes and close the dialog box.


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

7. You can also access the Signatures and Stationery dialog box from the Message window for new emails and drafts. Click New Email on the Home tab or double-click an email in the Drafts folder to access the Message window.

8. Click Signature in the Include section of the New Mail Message window and select Signatures from the drop-down menu.



Set up an Email Signature in Gmail

1. To set up a signature that will be automatically appended to any emails you compose in Gmail, click the settings gear button and select “Settings” from the drop-down menu.

2. Stay on the “General” tab, scroll down to the “Signature” section and select the option below “No signature” to turn the feature on.



3. Enter the text you want to use as your signature. If you have a logo, you can insert that as an image with your text or on its own.

4. You can also add hyperlinks to text in your signature, by selecting the text for the link and clicking the “Link” button on the toolbar.

I hope this helps.

Regards,
Lokesh