Answered By: Greg Sigountos Last Updated: Jun 27, 2014 Views: 98
Set rubric as your grading method when creating the assignment. Next, choose "save and display". Once you're viewing the assignment, under settings, choose "Advanced Grading", and then "Define Rubric".
When defining a rubric, be sure to create a zero-point level, even if you do not intend to use it. Moodle rubrics calculate their grades in such a way that the lowest possible grade is treated as a zero. (See link for details)