VEX GO Brain Pairing with 2nd Generation IQ Controller for Driving

How can I setup and configure my VEX GO brains to work with the 2nd Generation IQ Controllers. I cannot find any documentation on how to do it, and my attempts at pairing have been unsuccessful, but here’s a link to a primary schoold video in the UK that clearly shows them using a VEX GO robot and brain with an IQ 2nd Generation controller.