Okay, this is getting painful to watch.
A human thumb can only hit a button on a controller a few times per second at best, so for many video game consoles in the 80s and 90s, third party, and sometimes even first party, manufacturers produced controllers that would cause a button to be pressed dozens of times per second when pressed (turbo), or just fire automatically all the time (auto-fire). These controllers were common and helped in some, but not all games.
If you're planning on submitting a movie to Bisqwit's website, you're going to make a "tool-assisted speedrun", which means that you use the special features of an emulator to play as well as is conceivably possible. You do this by rerecording every jump, every stage, every SHOT, until everything is perfect and can't possibly be done any faster or better. To assist you in doing this, you will reduce the emulation speed of the emulator to just a few frames per second or, better yet, use a feature called frame advance to control what happens in every single frame. Such features are emulator specific, so read the instructions for your chosen emulator for questions about this.
You would never used autofire in a tool-assisted speedrun because a) it's not necessary, because you have an infinite number of attempts to shoot everything that you're trying to hit, and b) you never miss a shot in a TAS because it doesn't look cool. In a TAS, every shot hits something and everything is played perfectly so that everyone is impressed with how freaking amazing it looks. If you're submitting a movie, forget about turbo and auto-fire. You don't need them, because for one brief shining moment, your emulator will cause you, and any other human being, to no longer suck at video games.