The answer to 'how to fix fuse box' is to properly identify and replace a blown fuse. First, locate your home's fuse box, which is typically in the basement, garage, or utility room. Open the fuse box and examine each fuse to see if the metal strip inside is broken, indicating a blown fuse. If so, turn off the circuit breaker supplying power to that fuse, then unscrew the blown fuse and replace it with a new fuse of the same amperage. Once the new fuse is installed, turn the circuit breaker back on to restore power.
It's important to identify and fix the underlying cause that led to the fuse blowing in the first place, such as a short circuit or overloaded circuit. If you're not comfortable troubleshooting electrical issues, it's best to call a licensed electrician to inspect and repair the problem.