You have to go into your settings of your messaging app to set up how you want your notifications. If you got to the bottom of the settings menu there
I think you misunderstand: I want to be notified by my chosen ringtone when I get a text.
However, if I'm in the middle of something (ex: talking to boss, driving the car) I would like to be able to reach into my pocket and press a button to silence the ringer instead of pulling the phone out, sliding it to unlock, and sliding down the notifications tab.
In my past LG phones I could just hit the volume button on the side of the phone and it would silence the ringer, but that doesn't seem to work on the Droid.