If you're bridging your connection via proxy on your LAN, you don't need any special settings. If it's separate and setup on your LAN, then head over to Settings.app > Wifi. Tap the blue arrow next to your LAN, and enter a manual proxy
i did all that..the manual settings for my proxy are there including the proxy server and port but the thing is, all other apps seems to work fine apart from whatsapp and skype