Kan. Stat. § 17-1608
The charter may be altered or amended by any annual meeting or at any special meeting called for that purpose. Any amendment must first be approved by 2/3 of the directors and then be adopted by a vote representing a majority of all the members or voting stockholders of the association. In lieu of a vote representing a majority of all the members or voting stockholders, an amendment may be adopted by a vote of 2/3 of the voting members or voting stockholders present and voting at an annual meeting of the association or a special meeting called for the purpose of voting on the amendment and upon written notice sent by first-class mail to every member or voting stockholder at such member's or voting stockholder's last known post-office address at least 10 days prior to such meeting. Amendments to the charter when adopted as provided in this section shall be executed and filed and become effective in accordance with the provisions of the general corporation code.
K.S.A. 17-1608