It is currently our zen mode where we get home to rest so that we can come back to work the next day and assist you with your issues.
Official support hours is from 10AM — 7PM Monday to Friday (GMT +8)
However if I enter more than one I would expect the name of each list to be displayed together with a check box so the user can select one or more newsletters.
It is currently off working hours and most of us aren't around.
Rest assured that we will get back to your issues as soon as the day starts tomorrow!