Goto Manage Denominations under PIN management. This section allows you to add new denominations and deactivate/activate any previously created denominations.
Add New Denomination
Click on the Add New Denomination option once you are under Manage Denominations.
After this you will be taken to another page where you will be able to set the denomination and its status.
On the manage denomination screen you have the button to Deactivate the denomination, just click that to Deactivate.
On the manage denomination screen you have the button to Activate the denomination, just click that to Activate.