Introduction to Software Engineering ?!

Read the following scenario describing the use case "Marking assessments on Edugate system, then create a UML Activity Diagram for the scenario: "This use case begins when a student submits a solution to an assignment. The instructor logs into the Edugate system. The system verifies the entered password and prompts the instructor to re- enter his password if the password was incorrect up to three attempts. The instructor selects the class from the list of classes he/she teaches this semester. The instructor selects Mark Assignment option from the class main interface. If the student failed to submit a solution, the instructor sets the mark to zero, otherwise the instructor views the submitted solution, then enters the mark, then selects save. Finally, the system saves the mark