Repeat steps 6 - 9 for each grade you wish to add.
You can enter the grade rows in any order, but you must then use the Up and Down arrows to adjust the sequence of grade values to descending order before saving. i.e. the grade with the highest numerical value must be displayed at the top of the grid, then the grade with the second highest numerical value and so on. A grade with no value assigned should be displayed last, directly after the grade with the lowest value.