NoRedInk automatically saves your progress on assignments, quizzes, and diagnostics as you work. As soon as you submit an answer, the answer is saved before you see the next question. If you need to pause, just close your browser or tab.
Even if a you don't finish your assignment in class, you can come back later. The only deadline is the due date and time your teacher has set on the assignment.
To continue an assignment, you just need to return to your home page and click on the assignment.