You can simulate the alert to view exactly how will the notification look like. All you'll need is the block number of the chain, when the event you configured alert for has happened.
Click the "Simulate" button
Provide the block number
Click the confirmation button and receive the alert
Create Alert
Once you are done with configuring the alert, click "Create Alert", and you alert will be active!
What happens next:
Alert starts monitoring immediately
You'll receive notifications when conditions are met
Alert appears in your Alerts list
You are able to edit the alert anytime from the alerts page.