Relevant section of Bylaws:

V. Amendments to the By-Laws
 
Amendments to these by-laws may be proposed by the Executive Council, by a majority vote of the participants at the Annual Section Meeting, or by a petition containing the names of 25 percent of the members of the section submitted 30 days  prior to the Annual Section Meeting. Amendments should be voted upon by mail  ballot. Amendments to the by-laws become effective immediately after approval by two-thirds of the members returning their mail ballots.