If the alert has been verified, editing the expiry date cancels the
verification. The Verified ? field changes to 
No (unchecked).
To expire or deactivate an alert:
Click on Next Block to move from the Header block to the Date field of the Alerts block.
Query or use the arrow keys to locate the alert you wish to change.
Type in an Expiry Date in the Alerts block. Type in today’s date if you are deactivating the alert. Use standard date format.
If the alert has been verified, editing the expiry date cancels the
verification. The Verified ? field changes to No (unchecked).
Click on Save.
learn how to record an alert.