This article shows how to delete the WhatsApp application from an Android device.
Steps
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Step 1. Open the Android "Settings" application
Swipe down from the notification bar (located at the top of the screen) and tap the "Settings" icon
to open them.
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Step 2. Scroll down and tap Apps in the "Settings" menu
A list of all applications installed on the device will open.
On some devices this option is called "Applications" instead of "Apps"
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Step 3. Search and tap WhatsApp in the application list
A page will open containing all the information about the app.
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Step 4. Tap the Uninstall button
You will need to confirm the operation in a pop-up window.