To rename factors or change factor levels
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1    Choose Stat > DOE > Modify Design.

2    Choose Modify factors and click Specify.

3    In Continuous Factors, under Name, click in the first row and type the name of the first factor. Then, use the arrow key to move down the column and enter the remaining factor names.

4    Under Low, click in the row for the factor you would like to assign values and enter any numeric value. Use the arrow key to move to High and enter a numeric value that is greater than the value you entered Low.

5    Repeat step 2 to assign levels for other factors.

6    In Categorical Factors, under Name, click in the first row and type the name of the first factor. Then, use the arrow key to move down the column and enter the remaining factor names.

7    In Level Values, click in the row for the factor you would like to assign level values and enter any numeric or text value. Then, use the arrow key to move to the right and enter the values of the other factor levels.

8    Repeat step 7 to assign levels for other factors.

5    Click OK.