If you want to use the Android email app of Samsung Galaxy S6 and use a signature in your outgoing emails, then this article should help you to set up such a signature.
You canset up a signature like this on the Samsung Galaxy S6:
Open on your smartphone the Android email app. Then tap in the overview at the top right on "More" and then click Settings. Tap in the next the display window at the account to which you want to add a signature. You are now in the account settings of the selected account. In the same section you will find the button "signature". Tap on this and activate the controller to activate the option.
You can then enter your signature. By default, the signature "Sent from my Samsung Galaxy smartphone" is set.
You now know how to change the signature within the Android email app on the Samsung Galaxy S6.