Samsung Galaxy S5: How to Change Signature in Gmail App in Android 4.4.2 Kitkat

Gmail for Android app lets you append a signature text to every email message you send from your phone. By doing so, the information you have entered as the signature will be inserted automatically at the bottom of every outgoing email message.

How to change signature of an account in Gmail app?
As a note, if you have added multiple accounts in your Gmail app, you can create a unique signature for each account by using the following steps:

1. Open Gmail app. I use Gmail for Android version 5.1.90765967.
2. Tap at the top left corner of the screen to open up the Gmail app menus.
3. Scroll down the menus and then tap Settings.
4. Tap the required account you want to change its signature.
5. Tap Signature.
6. Now, you can enter your own signature here. As the example, you can create your own signature by including your name, phone number or other information you want to include in your signature.
7. Tap OK button.
8. The signature of the selected account has been changed.