To update an existing alert, access the Alerts page by clicking Alerts under Utilities in the lefthand navigation bar or hovering over the Notifications bell icon in the header and clicking the Manage Alerts link in the top right corner of the drop down.
From the Alerts page, find the Alert you would like to update and click Edit in the right hand column of the table.
Update your Alert as desired.
Click the green Save button at the bottom of the page to save your Alert.
If you wish to abandon the Alert update process, click the Cancel button at the bottom of the page prior to saving.