How to upload photos directly to Instagram from iPhone 4s photo album?

I have iPhone 4S, iOS7. And i want to upload directly from photo album to Instagram. But when I click on share there are only iCloud, Flickr, Tweeter, etc, but not Instagram. And I know that it is possible to enter Instagram site and from there upload. But Is there another way where I don't need to enter Instagram, just direcly upload picture to instagram?

I do not use any of this stuff, so I may be all wrong, but I thought Instagram was an app you loaded into the phone first, and when that is done, it should be no problem to put the photos into Instagram. I don't think you can just go to the site and send photos from your phone without having the application in the phone itself. If you have the Instagram app, I would think that when you click share, Instagram would be one of the choices, along with iCloud, Flickr etc.

Again, this is hardly an area of knowledge with me, just taking a best guess.

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