It is dependent on the state. Generally a bill would have to be introduced into the legislature and approved for a change to occur. The BON or any lobbying group (including the AMA) can lobby (AKA ask) a state representative to introduce a bill to change the current law. An individual citizen could even write a letter to a representative requesting a change, although that would be significantly less effective.
The best way that you, as an individual, can lobby for change is to join a professional group that supports your view of how things should be. You can also donate time and money to said groups.