How do I extend my visa exemption in Thailand, and what are the requirements?

The user inquires about extending their visa exemption, specifically asking for the appointment website, if the office location has changed, and whether they can renew their exemption on the expiration date. Several comments indicate that appointments may not be needed, clarify that extensions can be obtained, and suggest that one can renew their exemption as long as there are 45 days left on the current visa.