Ios 7.1.2 installation help needed?

I forgoy my iphone 4s passcode so now i had to restore it so i didnot had ios 7.1.2 so i downloaded it from internet and not after 2 hours when it has downloaded i don't know how to install into my iphone?
please please i need urgent help

You need to enter recovery mode to install your IPSW (iOS 7.1.2)

Read the following article to go through the process: http://support.apple.com/.../kb/ht1212

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