In order to connect your iPad to your keyboard use this 3 steps :
Please notice there are 2 options for doing that depending on your case
smart cases with the special
button on the top function row right side:
(in case you don't see this button on your keyboard then skip to Option 2 )
Option 2 :If you don't see this button on your keyboard
Use the key combo : Left Fn key + letter "C"
as shown in Picture: