how am i able to kill bob in the tutorial, please help, i put a knife in the kitchen and i want to use it

no problem. Go to the bob-object and then to his "Use/Give"-tab. There you find "Use (other object) on this", choose action: Handle objects individually and add the knife as key beneath it. Then you can add a script and do whatever you want with Bob

thanks a bunch, I did what you said and it worked perfectly