PPM Encoder-Turnigy Receiver

I am trying to connect the PPM Encoder to the channel receiver, but when I launch APM it does not detect the radio. I think it might have to do with binding the radio , I read that you need to press the button on the receiver and it would connect to the transmitter but that doesn’t seem to work. Is there any guide on it , or has someone done it before with a similar radio ?

Cheers !