This article shows how to delete the WhatsApp application from an Android device.
Steps
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.
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"
Step 3. Search and tap WhatsApp in the application list
A page will open containing all the information about the app.
Step 4. Tap the Uninstall button
You will need to confirm the operation in a pop-up window.