Spark plugs

So my fiance changed our spark plugs. He took them all out in a circle then put the new ones in the same way (in wrong firing order). Now the car starts for three seconds then shuts off. I have tried to redo it in the right firing order but it still does the same thing. I am not sure what to do next. We do not have any mechanics here that know what there doing that is why we tried doing it.