DIY 2.4ghz Remote HELP

please explain this bind procedure (on the remote) and how you wired it up.I have a Spektrum dm8 module and it wont go into bind mode at all. i have a dev board and when i hook it up there everything works fine. the jr pinout is different but i hooked it up correctly (i think) HELP

Sorry I have no clue anymore, it has been a couple of years…