At the reports due deadline, the reports get compiled and e-mailed. At the same moment the week gets rotated to new week. This Week is now a new week, Last Week is everything before the deadline (even if the calendar week is not past yet).
If you were late, what you can do is:
– Choose Last Week from Your form.
– Scroll down, at the end there is a link to reopen the Last Week's report.
– After they fill it in, there is a link again at the bottom to forward that late personal report to someone.
Since the main report would have been already be sent on deadline, this personal late report forwarding is the only way to send in late items.