Approval Number Matrix

How do I mark an approval number as (Not to be used)?

How do I mark an approval number as 'Not to be used'?

1.
Login to your account using the username and password provided.
2.
Hover over the Technical Management tab then Hover Over the Authorisations and Training Records Centre option in the dropdown and Click on the Approval Number Matrix.
3.
Click on the view button for the particular prefix reference.
4.
Select the Number not to be used.
5.
Click on EDIT button.
6.
Select the Tick Box as "Number not to be used".
7.
Click on SAVE button.