How to send signal from processor to state tree task in C++?

Hi, I am trying to implement the state tree for the MassAI but the documentation is less than lackluster. When I create a task for the state tree, there is a tick function that only get trigger when something call the "SignalEntity:, from what I know a processor can do it but I have no idea how to make a processor and a task communicate so the processor can send the signal and the task tick gets trigger