How do you replace a resistor on a bug zapper?

Answer 1

There's 2 pins on each side of bulb. Generally, you either push bulb to one side & mount will depress if spring-loaded or rotate the bulb to line up pins with slot & pull straight forward. It depends which of the two types you have.

Answer 2

They all have 2 pins that look like nail heads that go in a socket, just twist about a quarter turn or so to get the old one out. Make sure is unplugged first.