Connect your iPad to your computer, and open iTunes on your computer.
After a moment, your device appears in iTunes, below Devices on the left.
Select the device, and click Apps at the top of the iTunes window.
in the Apps list below File Sharing. (You may need to scroll to see it.)
Click Add below the iMovie Documents pane; in the window that appears, navigate to the file you want to add.
Select the file, and then click Open to copy the file to your device.
The file appears in the iMovie Documents pane when copying is complete.
Open iMovie on your device; if the marquee screen isn’t showing, tap the My Projects button in the upper-left corner above the viewer.
Tap the Import button at the bottom of the screen, and then tap the name of the project you want to import.
When the import is complete, the project opens and can be edited like any other project.