Any amendment to the articles of association must first be approved by a vote of not less than two-thirds of all of the members of the board of directors. Such proposed amendment shall then be submitted to either a regular or a special meeting of the members of the association, and its adoption shall require a majority of all the members whose names are of record on the books of the association. Absent members may vote at such meeting, on such proposed amendments, either in writing, or by proxy, addressed to the secretary of the association. In such case the secretary shall read and announce the vote of such absent members. Amendments to the articles of association when so adopted, shall be certified to by the president and secretary of the association, and shall be filed with the Secretary of State. Such certification and filing shall be conclusive evidence of the validity of such amendment.