If you have generated individual charts, charts analyzing only one part number each, you can change the standard for the part number of your active window by clicking on Setup, Current Value.
If you have generated multiple charts, charts analyzing all of your selected part numbers in one chart, click on Setup, Standards.
Then highlight the first part number whose Standard information you want to change and click on Edit.
Click OK after making the changes you want. You can continue editing by highlighting the next part number whose Standard information you want to change by clicking on Edit. Click on Exit.