Select the Rubrics tool from the Tool Menu of your site.
Select Edit Criterion to rename the default criteria.
Select the pencil icon next to the rating item you wish to edit.
To add another rating level to a criterion, mouse over the line separating one rating from the next and click on the + icon [Add rating to Criterion] to insert a new rating level at that location.
Select the Copy icon [Clone Criterion] to copy an existing criterion.
Tip: Sometimes it is easier to copy an existing criterion and edit the copy, than to add a new one.
You can change the order of both criteria and ratings by clicking on the Reorder icon in each cell and dragging the selected item to its new location.