Hi Amin
You usually define a human task for your human related activities.
Inside that task the users can introduce information that will be used lately by the process in order to decide which will be the next activities in the flow.
In jBPM5 you usually don't signal the process to continue. It is usually the user that ends a human task and based on the information provided inside the task the process definition choose between different paths to continue.
Is that what you are looking for?
Greetings.