I would start by replacing
$register="INSERT INTO manilaslota(fullname,adress,email,contact,date,starttime,endtime) VALUES('$fullname','$adress','$email','$contact','$date','$starttime','$endtime')" or die
by
$register="INSERT INTO manilaslota(fullname,adress,email,contact,date,starttime,endtime) VALUES('$fullname','$adress','$email','$contact','$date','$starttime','$endtime') or die";