Downloaded ios7, but how do I install it?

I downloaded ios7 for my iphone but now when I click "update" it starts downloading ios7 again rather than just installing the one thats already downloaded! What am I doing wrong or how do I get the fully-downloaded one to install? Waiting to downloaded it again would take hours. Note: By... show more I downloaded ios7 for my iphone but now when I click "update" it starts downloading ios7 again rather than just installing the one thats already downloaded!

What am I doing wrong or how do I get the fully-downloaded one to install?

Waiting to downloaded it again would take hours.

Note: By downloaded I mean I clicked the "download only"option rather than download and install
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