How do I edit a rubric?
Important: The max point value for an activity that you want to grade with a rubric should match the point value for that rubric. A rubric’s point value is the sum of the max point value for each criterion in that rubric. If you grade an activity with a rubric whose point value does not match the max point value for that activity, then students’ point scores may be arbitrarily distorted.
Note: You may only edit rubrics that are local to your site, and that have not been associated with an item for grading. Once a rubric is in use, it will appear with a lock icon next to it, indicating that it cannot be edited.
Go to Rubrics.

Select the Rubrics tool from the tool menu of your site.
Select the title of the rubric you would like to edit to expand it.
Remember, locked rubrics may not be edited.
The Lock icon indicates that a rubric is associated with an activity in the site and it cannot be edited. If you need to edit a locked rubric, you should either detach it from the activity where it is being used, or make a copy of the rubric and edit the copy.
Select the Edit icon next to the rubric title to rename it.

Modify the title and Save.

Select the Edit icon next to a criterion to modify that criterion.
Modify the criterion title and/or description and Save.

Add as many new criteria as needed.
Select Add Criterion to add a new row.
Or, copy an existing criterion.
Select the Copy icon 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.
Select the Edit icon next to a rating to modify that rating.
Modify the rating title, points, and/or description and Save.

Add ratings to a criterion where needed.
To add another rating level to a criterion, mouse over the line separating one rating from the next and click on the + icon to insert a new rating level to the right of that location.
Delete any ratings you don’t need.
Select the pencil icon next to the rating item you wish to remove.
Select Remove.
Drag and drop to reorder.
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.