Key Features

Provide app-only coupons and discounts
Provide auto login features
See my order history, Shipping info
See shopping cart, shipping info
Push notifications for shopping mall news
Share product info with SNS
Customer Center

Make sure that third-party apps are allowed on your device: go to Menu->Settings->Security-> and check "Unknown Sources"

Tap the APK file. Allow the app any required permissions it asks for. Then, at the bottom of the installer window, click INSTALL.

You'll see a confirmation the app is installed. Now you'll see the app available in your list of installed apps.