Any Free Methodist church heretofore incorporated, or the trustees of which have heretofore exercised the powers of a body corporate, may by a 2/3 vote of the members of the society, place itself under the provisions of this act, the same as if originally incorporated under it, by 2/3 of the members of said society executing articles of association as provided in section 3 of this act, and the district elder affixing his certificate thereto, as provided in said section, and recording the same, as provided in section 4 of this act.