WHAT ADAPTER DO I GET?

I just got a strobe/trigger lighting kit and it came with the remote trigger, and I can't find the adapter cable that would work for my Nikon D90… Can you help?

http://www.ls-photostudio.com/shop/index.php/equipment/accessories/4-channel-radio-remote-trigger-receiver-set-for-studio-strobe.html

You slip the trigger in the hotshoe on the camera and hook up the receiver to whatever flash you have