Need help to pair Smart Keyboard to ipad

The Apple Smart “folio” keyboard connects to an iPad using the three-pin smart connector on the rear or edge of the matching iPad. There is no Bluetooth “pairing” to perform. The Smart folio keyboard attaches magnetically to the matching iPad.

You must select the correct model of Smart folio keyboard to match the iPad.

If you can't connect your iPad to your Magic Keyboard, Smart Keyboard, or Smart Keyboard Folio - Apple Support