S.C. Code Ann. § 33-43-105
(A) A limited liability company and a foreign limited liability company authorized to do business in South Carolina shall continuously maintain in this State:
(B) A limited liability company or a foreign limited liability company may change its registered office or registered agent by delivering to the Secretary of State for filing a statement of change that sets forth:
(D) A registered agent may resign his agency appointment by signing and delivering to the Secretary of State for filing the signed original and two exact or conformed copies of a statement or resignation. The statement may include a statement that the registered office is also discontinued.