After creating your assignment you'll be taken to the assignment overview page, from here click on the Settings tab to get to the assignment settings.
Here you can adjust all settings by clicking on the sidebar (seen in the image below).
- Submissions: specify types of submissions
- Feedback: adjust the number of reviews
- Groups: allow group submissions
- Categories: create submission categories
- Rubric: allow preview or weighting
- Advanced: disable flags or change anonymity