(1)    Right to amend articles. The articles of a fraternal may provide for amendment by the supreme governing body or by the board of directors, and may provide also for amendment by the members by referendum. If amendment is by referendum, a majority of those members who vote must vote affirmatively. Votes cast within 60 days from the date of mailing of the ballots by the fraternal shall be counted. The timeliness of a vote is determined by the date of its mailing as proved by its postmark or other suitable evidence.

   (2)   Filing. For 5 years after the initial issuance of a certificate of authority, proposed amendments of the articles which are not changes in the business plan shall be filed with the commissioner at least 30 days before the amendment is submitted for approval to the members or to the supreme governing body, or if neither is required, at least 30 days before its effective date.

   (3)   Filing of articles of amendment. No amendment is effective until the articles of amendment are filed with the commissioner, together with a statement of the results of the voting on the amendment.

   (4)   Publication to members. Within 4 months after the filing of the articles of amendment with the commissioner, they shall be furnished to all members either by mail or under s. 614.41 (1).