Under which icon is my SD card's files found?

I downloaded whatsapp onto my LG s555 and was told it's stored on my SD card but I can't seem to find the icon showing files on the card even though it's in

    Hi Helen. Did you just download the app or have you already installed it? If you have not installed it yet, use your phone's file manager and check all folders until you find the file. If it's already installed, you should see the icon together with your other installed apps.

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