Dynamis Extending Receiver

[MrSkippyLee]

Hello, I bought the Dynamis #36505 command station system and the extending wireless receiver #36509, the problem I'm having is I can't figure out where or how the cable for the extending receiver plugs into the command station? The command station already has a receiver on top, but I don't see an additional port for the extender.
Any help would be appreciated.