Here is the guide to create or modify signature for every email.
1. Follow the steps of "Setting" - "Signature"
2. Then you will see two boxes for you to enter any content. The upper one is signature of every new email and the other one is setting for signature for the Reply or Forward. You can simply tick the "Use the same on as new email" to make the signature for the Reply or Forward the same one as the one for every new email.
3. You can set the QR code to tag along every new email by ticking the "Tag my QR code name card in new emails".