Step 1 - Click on your Mail app icon
Step 2 - While in the email app, click on the MENU button of your device.
Step 3 - Click on MORE option
Step 4 - Then click on SETTINGS
Step 5 - Now click on the email address you’d like to setup the signature.
Step 6 - Now click on the GENERAL SETTINGS and/or SIGNATURE.
Step 7 - Enter the text for the signature you’d like here and then click the OK button
Step 8 - That’s it! Now every time you send a message from this email account you’ll have this signature automatically added to the bottom of the email.