Tap on the “icon” next to the Wi-Fi network to access the specific settings of the wireless connection.Tap on the Wi-Fi settings category and you will be at a screen as shown below.When the Settings app loads, you will be at the General Settings category. Check “Use a proxy server for your LAN” and enter the network address and port of the proxy as follows:.
Click the “LAN Settings” button at the bottom of the window.