Ow do I turn on a Dansrue keyboard for Apple iPad?

Once you connect the n4e keyboard, the virtual keyboard should disappear. Connect the keyboard using Bluetooth, be sure Bluetooth is turned on, and pair the keyboard.

It's fairly easy to set up usually. With the keyboard powered on there is usually a button that turns bluetooth on and a (usually) blue light will start flashing. At this point on the iPad you look in the bluetooth settings page and look for the keyboard to appear in the available devices. Tap the link to it and follow the instruction. The blue light should stop flashing and remain lit and the iPad BT settings will show that the keyboard is connected.

Belkin keyboard pairing to iPad

Is the keyboard split? I haven't heard of a split screen in iPad before. If it is the keyboard, just use 2 fingers to push the sides back together.

check the manual...!
depends on the model - but it works with bluetooth- see a sample :
put the iPad in the slot built into the keyboard, and pair it with your iPad via Bluetooth
On your iPad, tap the Settings icon and then tap Bluetooth. Make sure Bluetooth is On.
Connect the Logitech Ultrathin Keyboard Cover i5 Logitech Support Article

Perhaps you look on this link to see you did everything right, like charging the battery, switching on and pairing. Don't forget to switch on bluetooth on your iPad. SHARKK Apple iPad Air Wireless Bluetooth Keyboard Case

The following page on the Apple help website may help you with the keyboard not displaying as expected:

http://support.apple.com/kb/ts3280

Hope that helps!

Check that the keyboard's battery is working and it's on. Turn on Bluetooth on the iPad (Settings > Bluetooth). Press the keyboard Connect button. Choose the ZAGG Keyboard on the iPad, and type the code on the keyboard.
This doc describes the process: http://cfprod.zagg.com/downloads/ZAGGfolio%20instructions/ZAGGfolio%20instructions.pdf
Good luck! :)

I'm assuming Bluetooth is turned on on the ipad.

follow the keyboard instructions to put it in pairing mode.

Then in ipad settings - Bluetooth you may need to select the keyboard.