Go to how to login to wifi on ipad page via official link below
Login using your username and password. Login screen appears upon successful login
If you still can't access how to login to wifi on ipad then see Troublshooting options or contact us for help.
Connect to Wi-Fi on your iPhone iPad or iPod touch Learn how to connect your device to a Wi-Fi network including open secure public networks and networks that you've connected with in the past. Connect to a Wi-Fi network From your Home screen go to Settings > Wi-Fi.
Tap Settings > Wi-Fi and toggle on the Wi-Fi slider.; Connect to public network: Tap the network name. Connect to private network: Tap the network name enter network's password tap Join.; Shortcut: Go to Control Center and tap the Wi-Fi icon.Your iPad will join any nearby Wi-Fi network that it connected to in the past.
Screen showing the iPad connected to a wireless network Simply fill in the URL field with the proxy autoconfiguration URL. When you are done setting up your proxy server tap on the Wi-Fi Networks...
Tap "Wi-Fi". This is typically located towards the top of the list of options. Ensure that the Wi-Fi slider is toggled ON. It will be green (iOS 7) or blue (iOS 6) if it is enabled.
Turn ON your network hub and wait for the DSL or Internet to get connected (30 secs to 1 minute in my case) or walk back in range Then click the Join button on the iPad Voila as they say in Texas
Go to Settings on your iPhone/iPad. Select Wi-Fi. In my case WiFi is off after I turn it on I'll see available networks. Below Wi-Fi toggle under "CHOOSE A NETWORK" you'll see available WiFi networks. You will have to know name of the WiFi network you want to connect to.
Search for Keychain Access and open the app. Use the search box in Keychain Access at the top right of the window to search for the Wi-Fi network by name. You can then click on the Wi-Fi network name to open the item. From the attributes tab press the check box next to show password.
(If you've skipped the previous steps you can get to the correct screen by going into your iPad's settings and choosing Wi-Fi from the list on the left side of the screen.) To reset the iPad's Wi-Fi connection simply use the option at the top of the screen to turn Wi-Fi Off. All of the Wi-Fi settings will disappear. Next simply turn it back ...
From the main screen open Settings. Tap Wi-Fi to open Wi-Fi settings. Select your Wi-Fi network name from the list. Tap Forget This Network.
As usual first open iPhone > Settings > Wi-Fi > Select Open Wi-Fi tap on Wi-Fi to select the Wi-Fi to connect. Now your iPhone will connect to the network and supposed to load the login/authentication page automatically. Otherwise you will see a checkmark near to connected Wi-Fi but won't be able to load any web pages.