How to install ios app Last update: • 4 months ago By Staff DDTank Two Step 1: Install the App Click the button below to install the app on your iPhone. DOWNLOAD NOW When this message appears, tap the Install button. Go to the Home Screen and you will see the app installing Step 2: Authorize the App Certificate. You will see this message automatically after the app is installed or when you open the app for the first time. On your iPhone, go to Settings > General > VPN & Device Management and trust the app certificate. Now just click the Trust button to grant the app permission Step 3: Open the App Now you should be able to open the app on your iPhone. Enjoy!