Question: how do i change my email signature on my samsung galaxy s9?
Answer: From a Home screen, swipe up or down from the center of the display to access the apps screen. ... 
Tap Email .
Tap the Menu icon (upper-left) then tap the Gear icon .
From the Accounts section, select the appropriate email address. ... 
From the Account settings section, tap the Signature switch to turn on or off .