Assuming you are using the Plus Edition, AFAIK, this is not within Fastcuts limited editing capabilities.
If you require more control over the editing then you would need to move up to a more fully featured program such as Photostory or Movie Edit Pro.
Photostory Deluxe can do what you require, however if you do move up to Movie Edit Pro then get the Premium version, it is currently on offer and cheaper than the Plus edition and will work out more economical than buying the Basic version and adding features on.