How to upload pictures from my picture library on my iphone to instagram?

I want to upload photos from my iphone to instagram. How do i do it?

Go to the take picture button In Instagram and on the bottom right it has a picture, click it and choose a photo

Wht the person below said

Hmm the photos are probably saved in your cell thats the iphone right open instagram app or go from your web browser and while uploading pics go to the place where your pics are saved

eg:
c. Phone memory)/images/photo001.jpg

just giving eg

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