Sorry this video will no longer help you out.... Unfortunately this app has been removed from the App Store. I am not aware currently of any other application you can get for free to copy and share videos. Luckily if you got the app before it was removed you can still use it...Please share or comment if you know other ways to do this.
Aug 28th 2014
It's really easy to repost and share videos on Instagram, you just need an app. The app is called "best video". It's orange with a white arrow pointing down. It's the easiest app to use that i've found and it's free.