How are laws changed?

Answer 1

How are laws made - 'legislative process'

Congress (Federal) or General Assembly (State)

Committee -> Introduced during legislative session -> voted -> signed into law.

A 'change' in a law is actually a new law in itself, even with nulling the previous law.

Interpretation of the law rests in the hands of the Executive powers (President/Governor) with the powers of process, priority, and rule making authority.

If an issue arises to an Executive's interpretation of the law, the judicial/courts determine the 'correct' interpretation of the law.

Answer 2

Laws are made and changed by legislators. In democratic countries that job is done by the legislature or parliament, consisting of elected individuals.