Imovie app help

[iMore Question]

Hi I'm struggling a little with imovie app.
2 questions
I'm using iphone 4

1. Is there a way to stop imovie from automatically going into 3:4 ratio, it's cropping all my video (taken on the iphone) from native format?
I'm trying to overlay

2. I'm trying to overlay video, in the help it states
"
To add the clip?s audio only: Tap the clip, tap the More Options button , then tap the Audio Only button .

To add the clip as an overlay: Tap the clip, tap the More Options button , then tap one of the following options"

I don't seem to have any "more option" buttons in the media browser??

Cheers Richard