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Without more information, your question is difficult to answer. Changing an existing law, is difficult, even if there is an overwhelming majority of the people in one district, that want to change it.
First you need to be able to understand the entire history of the law you wish to change, why was it enacted, when was it enacted, what events, or political landscape, prompted the law to be written in the first place etc. You will then need to demonstrate the reasons, you want the law to be changed. Laws effect everyone, sometimes in different ways, so "because me and my neighbors don't like it" is not going to get you very far.
Meet with the representatives in your district, either at the Capitol,or in their district office(s). explain your reasons for wanting the change, bring any and all petitions, affidavits, examples, of how the law has negatively effected you and others, etc. Then ask your representatives, how they think you should proceed, their opinions, on the proposed changes, and any additional changes they feel would be viable. This is a very condensed version of how you may want to proceed, and don't expect quick answers, or a quick turnaround. Legislative sessions, have a huge number of bills, proposed bills, referendums, etc, long before the session starts, so unless you have major support from several districts, the chances are, you proposed changes, may never see the floor in the Capitol. If you are determined, and can garner enough support from others, you can effect change, but it takes a lot of work, dedication, and research. You may also have to deal with representatives, who even if they support you proposals, will lose a re-election bid. That's the nature of the beast.