I don't know anything about that particular keyboard, but, basically you can use any keyboard that has MIDI with FL. Haven't heard of any you can't so far.
You have to hook it up to your computer either through USB cable or MIDI cable, depending on what outs is on the keyboard. If there's only MIDI-out and no USB, you need a MIDI-in port on your computer of course. So if you don't have a soundcard with one, you can buy a new soundcard, or you can buy a MIDI-interface.
I haven't used conversion cables like the one Eirebeatz mentioned, but I'm sure that also will work fine.