samsung s5. editing in messaging

[AC Question]

When I open messaging, I do not have an option for 'editing' or 'settings'. I only want to edit notification sounds for incoming texts, not sounds for all notifications. how do I get to edit or settings once I open messaging? I do NOT have a 3 dot bar for menu or edit or settings. help!!???!!! thank you

 

[B. Diddy]

Welcome to Android Central! Is this the stock Samsung Messaging app, or some other app like Google Messenger or Hangouts?