It looks like your tablet is not Bluetooth-enabled, in which case you cannot connect the Bluetooth keyboard to it. You may try to connect a regular keyboard via the USB port on the tablet (although I believe that USB port may accept only flash drives).
Answers & Comments
It looks like your tablet is not Bluetooth-enabled, in which case you cannot connect the Bluetooth keyboard to it. You may try to connect a regular keyboard via the USB port on the tablet (although I believe that USB port may accept only flash drives).
http://www.nextbookusa.com/pdfs/Next7P12-8G%20Tech%20Spec%20102412.pdf