You can manage assignments by tapping on the Assignment button on the lower left corner, tapping on the Menu options on the upper left corner and then on the Plus sign. By following this steps you can create and customize assignments for your students.
To manage grades, stay on the Assignments mode and tap on the Grades button and then on the student name.
If you need more detailed information, please check our video tutorials.
Here is the link: http://igradeforteachers.com/tutorials