S.C. Code § 33-36-300
The original bylaws of a corporation not-for-profit must be adopted by its incorporators. After that, bylaws must be adopted, amended, or repealed by the members, except that the corporation's governing body may enact emergency bylaws in the same manner as provided for nonprofit corporations in Section 33-31-207. The governing board also may adopt changes to the bylaws by a two-thirds vote when necessary to conform with state or federal laws governing the operation of the corporation or the services provided by the corporation. This power to amend the bylaws by the board may not be used to conform to permissive powers granted in state or federal legislation or to undertake services not already provided by the corporation.
S.C. Code § 33-36-300