Each limited liability company shall have: A principal office in this State; and A resident agent. A limited liability company may designate or change its resident agent or principal office by filing for record with the Department a statement signed by an authorized person which authorizes the designation or change. A limited liability company may change the address of its resident agent by filing for record with the Department a statement of the change signed by an authorized person. A designation or change of a principal office or resident agent or address of the resident agent for a limited liability company under this subsection is effective when the Department accepts the statement for record. A resident agent who changes addresses in this State may notify the Department of the change by filing for record with the Department a statement of the change signed by or on behalf of the resident agent. The statement shall include: The name of the limited liability company for which the change is effective; The old and new addresses of the resident agent; and The date on which the change is effective. If the old and new addresses of the resident agent are the same as the old and new addresses of the principal office of the limited liability company, the statement may include a change of address of the principal office if: The resident agent notifies the limited liability company in writing; and The statement recites that notice has been sent. The change of address of the resident agent or principal office is effective when the Department accepts the statement for record. A resident agent may resign by filing with the Department a counterpart or photocopy of the signed resignation. Unless a later time is specified in the resignation, it is effective: At the time it is filed with the Department, if the limited liability company has appointed a successor resident agent; or 10 days after it is filed with the Department, if the limited liability company has not appointed a successor resident agent.