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By clicking on the 'Cogwheel icon' and 'Edit settings' within your assignment or while you are setting up the Assignment in the first place, select in the 'Grade' section

From the "GradeGrading method" field, select 'Rubric'

Alternatively there  there is the option to use a marking guide (see below)

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1. By clicking on the 'Cogwheel icon' and 'Edit settings' within your assignment or while you are setting up the Assignment in the first place, select in the 'Grade' section
2. In the "GradeGrading method" field, select 'Marking guide' from the dropdown menu
3. When you have created the assignment, click into it
4. From the 'Cogwheel' drop-down menu, select 'Define marking guide'.

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