Mo. Rev. Stat. § 349.040
The articles of incorporation may at any time and from time to time be amended so as to make any changes therein and add any provisions thereto which might have been included in the articles of incorporation in the first instance. Any such amendment shall be effected in the following manner: The members of the board of directors of the corporation shall file with the governing body of the county or municipality an application in writing seeking permission to amend the articles of incorporation, specifying in such application the amendment proposed to be made. Such governing body shall consider such application and, if they find it is wise, expedient, necessary or advisable that the proposed amendment be made and shall authorize the same to be made and shall approve the form of the proposed amendment, then the persons making such application shall execute an instrument embodying the amendment specified in such application, and shall file the same with the secretary of state. The proposed amendment shall be subscribed and acknowledged by each member of the board of directors before an officer authorized by the laws of Missouri to take acknowledgments to deeds. Such secretary of state shall thereupon examine the proposed amendment and, if he finds that the requirements of this section have been complied with and the proposed amendment is within the scope of what might be included in the original articles of incorporation, he shall approve the amendment and record it in an appropriate book in his office. When such amendment has been so made, filed and approved, it shall thereupon become effective and the articles of incorporation shall thereupon be amended to the extent provided in the amendment. The articles of incorporation shall not be amended except in the manner provided in this section.
§ 349.040, RSMo