Make sure you still have editing turned on. In the topic you want to add your new assignment to (in my case my new, hidden topic) click on Add an activity... and choose Offline activity from the list. You're now taken to the Editing assignment page.

Give your assignment a name. Enter in a brief description of the task in the Description box. Don't worry if the box looks a bit small. We can include all of the supporting materials in the topic together with the assignment activity itself on the course front page:

3. Use the Grade setting to specify the maximum grade you are going to give for this assignment. I'm going to leave the Grade setting at 100 (meaning I can grade this assignment out of 100). Maybe your assignment forms part of an overall mark and you need to mark it out of less. You could choose to mark your assignment in this way. You can even choose to create your own custom grades (e.g. A, B, C, D, E, or F), which we learn how...