I have gone to different sites and asked ALOT of people ... Where can I change the ringer to the Blackberry Messenger. All it does is blink with no sound. This is driving me crazy!
Don't know which sites and which "alot" of people you asked, but you've come to the right place.
click the profile icon (the speaker looking one), then scroll to advanced. Click that.
Scroll to the profile you want to use and highlight it (don't click it, just highlight it). Hit the Blackberry menu button. Click edit. scroll down to messenger - new message. Click it.
You'll see where you can change the ring tone associated with a new BB messenger message.
and asked ALOT of people 
. Just kidding 