1. Open the site where you have the Alerts web part installed;

  2. Click Bindtuning, and then Edit Web parts to edit the web part;

  3. On the web part sidebar click the Manage Alerts icon;

  4. The list of alerts will appear. Click the trash can icon to delete the alert that you want to remove;

  5. A message will appear requesting your confirmation. Click Ok and the web part will refresh and the alert will be removed.