How to share photos to Instagram through the Photos app? (iPhone 4)?

I got an iPhone today, first one ever. But when I try to share a photo from my photo library, or the 'Camera Roll' I go to share, and the option is not here. However twitter, facebook, messages, flickr etc is.

I went to privacy in settings, then photos, and allowed instagram along with twitter and facebook etc.

So why is Instagram not an option to share on my camera roll?

Maybe the app has a bug? It works fine for me. Or maybe you restricted that app?

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