Can I extend my 90-day report online, and what are the timing rules for this process?

The user inquires about the process for extending their 90-day report, including the possibility of doing it online and the appropriate timing. Responses indicate that the 90-day report can be filed online or in person and that it must be completed within a window of two weeks before to one week after the due date. Additionally, they should report their new address by filing a TM30 form at their local immigration office within 24 hours of arrival.