Route the AFCI neutral pigtail and ground wires to empty screws on the neutral bus and tighten. If you're installing a breaker on a sub-panel, place the neutral and ground on separate bus bars.

Stand to the side of the panel and turn your face away ... are specifically designed to monitor for ground faults, but regular circuit breakers also provide protection. How To Fix a Circuit ...

In a properly grounded system, appliances and metal boxes connect back to the grounding bus of the breaker panel. From there, the system is grounded to the earth via buried ground rods.

But even if your fuse box is in good working order, you might consider replacing it anyway since circuit breakers are much better at handling the electricity needs of modern homes than fuse boxes.