Enter "Gradebook Settings" by clicking on the Gear icon.
Click on "Manage Grade Schemas" within the "Grade Schemas" section.
Adding a Grading Schema
Click on the + Add button.
Enter the name of the name of the new schema and press the Add button.
Edit the "Grade Name" and "Grade Range %" for the first entry by clicking on the three dots and then the Edit button. The first one in this example will be changed to "Exemplary".
If desired, add more "Grade Names" by hovering over the line between two grades, selecting the +, then "Add Grade below ...".
Continue adding "Grade Names" until the schema looks the way you want, then press the Save button.
Using a Grading Schema
Open the assessment.
Find the Grade section under "Assignment Settings" and click on the first link. In this example it is currently using the Points schema.
Open the selection window for "Grade using", select the schema to be used and press Save.