Go to the Alerts app.

Click on the alert you want to update. This will open a dialog with the alert details.

Toggle off the Alert state slider if you want to temporarily disable the alert.

Click Edit to edit the setup of the alert and make the desired changes.

Go to Step 5 in the guide and click Update alert to finish and update the alert.

Go to the Alerts app.

Select the alert you want to delete. This will open a dialog with the alert details.

Click Delete.

Confirm that you want to delete the alert.