Step 1: Get tapping
Tap on the Plus button in the opening page of iMovie (you need to have the new 1.3 version) and then select the New Trailer option.
Step 2: Pick a template
You are now at the template chooser stage. Scroll left and right to see the templates (gallery is on the right) and then tap the Play button to preview.
Step 3: Create and credit
Tap the Create button in top-right of the screen and then begin to edit your trailer credits by tapping into each available text box.
Step 4: Tab, touch and scroll
With the credits filled in, tap the bottom tab to see this screen. This is where you add your video, which should be displayed at the bottom of the screen.
Step 5: Tap the arrow
Tap on the part of the clip that you want to add it to and then tap the arrow to send it into the selected placeholder on the left-hand side.
Step 6: Keep on tapping
Repeat the process until all of the place holders are full and then hit the Play button to see your final trailer. This is now saved and can be accessed on the first screen.