Connect joystick with herelink

I am using herelink version BRU01210730.
I want to use herelink as a joystick and Send radio data using telemetry.
I found a video on youtube that he did it. I will share the link with you : HereLink Joystick Button Calibration - YouTube
My problem is that I dont know how the connections should be made and how the wiring should be done.
And my second problem is that I can not find “joystick” tab.
Does anyone have a similar experience to share with me?