At first, you have to have the Pulse messaging app be the default on both the phone and on the watch. Run it a couple of times, watch it sync with each other, and then you can run your normal messaging app (Verizon Message+) on your phone and use it normally. And now, whenever you get a text, while on your phone you can use whatever texting/messaging app you wish, it will come on your watch through Pulse (the pulse app on your watch particularly), even if it's default as another app on your phone -- I'm not sure if it must be at least default on the watch.

Give that a try and see if it works out for you, because me and JOG0277​ have it working just fine.....