Actually, that's still quite confusing. I'm assuming that by "photon sample scenes package", you actually mean "Playmaker Photon Demo".
Then, if I dig around enough, I'm assuming you mean the PlaymakerTestGame scene, since it has chat in it. When I use "assume" in the above, it's because the link you included to documentation is for the Photon DemoWorker sample, which, as far as I can tell, has no playmaker components at all. I need a non-photon solution.
Even if all the above is correct, everything I see here uses PhotonViewRpcBroadcastFsmEvent. I cannot use a Photon because there are too many issues with their solution. Even if I could, the docs for the string portion of PhotonViewRpcBroadcastFsmEvent are identical to Playmaker's SendRemoteEvent:
"Optionnal string data ( will be injected in the Event data. Use 'get Event Info' action to retrieve it)"
As far as I can find, there doesn't seem to be any further explanation of what "Use 'get Event Info' action to retrieve it" means, so I have no idea how to set this up.
Once again, I'll freely admit that it's probably really simple and I'll probably smack my head when I see it and say "Oh, yeah! Why didn't I see that?" SendRemoteEvent may not even be what I should be using here. I just don't know.
If I just had a hint of the basic workflow or concept and a list of which actions I should be using, I could probably figure it out. I get the feeling that once I do figure it all out, it's probably another tutorial I should write