Injector problem ?? HELP PLEASE

For high life v1.3 the extreme injector v2.1 is recommended. When it says to type in Engine.exe the box underneath is grayed out and i can't do anything ... Even so if i press autoinject nothing happens, can someone help me and explain how this works or is done, link me to a tutorial, or send me another injector such as PerX ? thanks, i used to hack, now i want to again and everything has changed!

I personly dont like to use any other injector but PerX. PerX is very basic, and hasnt failed me yet XD