unable to make booking on mtt booking website

wont let me select a date, ive tried changing it for booking counter k and other catogories, and also changing the dates and its got a red circle with a line through it for all dates, are u still required to book for mtt? as last time i went they didnt even ask i just walked through the door for counter J ( im on tourist 60 so i need J ) 

it seemed that you only needed to show booking at counter K ( at the tent because they have ppl sitting there wasting peoples time checking docs, only for them to check them again later)

ive tried doing it on iphone and also laptop and you cant select a time or date for any catogory ?

i was thinkign of going friday tomorrow because i think monday will be chaos again