I’m having problems to relate the class (actor) to the actor in the sequence diagram. I’m modelling a Login Use case and I have to validate the username and password. When I use the methods related to the class “system”, I can get the methods by the call message and selecting the operation. But when the system requires data from the actor, it should be a way to call an actor’s operation. I checked out the actor specification looking for an option to relate a class to the actor, but I couldn’t solve it. (the number sequence 2)
Is there a way to do it?