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.

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.

I asked her to find the GFCI (ground fault circuit interrupter ... look for a GFCI before you even bother with the breaker ...