Step 1: Edit the class where the assessment belongs
Step 2: Edit the settings you would like to change and click 'Save' at the bottom.
Please see below for what instructors are able to make changes to:
If there are no student submissions, then the assessment is fully editable (All properties and the Rubric).
When students start submitting, we lock down the Rubric so that the instructor cannot modify it. All other options not related to the Rubric in the Assessment stay active and editable.