'65 Dart-Lights flickered, lost electrical, loud bang, car died

Alright, I hate to sound like an idiot but this is next to gibberish for me! Mechanical stuff makes sense, but I know next to nothing about electric systems. I finally just got some time to go outside and try a few of the above suggestions, but I got confused. So, let's start small:

How exactly do I go about checking and repairing the fuse link? I need instructions to be this simple: Where do I connect the gator clip end of my testor light, and where do I touch the probe end?

Thanks for bearing with me, I really appreciate it.