Spektrum tranmitter & receiver problem

[Durango racing]

I have just brought spektrum dx2e and a secondhand sr3500 but can't get to bind together I have a green light on my tranmitter and the receiver is flashing orange all the time does anyone if they work together or do I need to get another receiver !! If I need another receiver want do I buy as need a mirco receiver as I have durango 410 not much room any help would be great!!