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You can enable an alert by:
Go to Reminders > Setup
From the “Filter by Event” drop down select the event eg On Accident /Incident Created
Once the page refreshes you will be able to see the Alerts that has been enabled
Tick in the check box on your right in the “Filter “icon Column for “On Accident /Incident Created” and click on the Enable Disable button (See image)
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5.You will get a pop up
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6. Click on Enable