First off this is in the wrong section. Try reading the rules and stickies before posting.
But it depends on what injector you are using. Most hacks are injected when hackshield, xtrap, and other hacking prevention programs pop up. Most injectors also have a function for this. Like in PerX you can check autoinject and autoclose and when you type in the .exe, for CF it's CrossFire.exe, it will inject the .dll you selected and inject it into the game. If this doesn't work or the game won't open, your hack is most likely patched.
/Moved to CF Help.