Download the injector, select .dll file (click on 'Auto inject' and 'close after injection', if present), and run Crossfire.
DO NOT OPEN THE INJECTOR IF YOU HAVE CROSSFIRE OPEN, first close Crossfire(!).
If you get an error "Hack tool has been detected" it means the injector is old and detected. If Xtrap gives you an error, the hack (.dll) is detected.