First you have to win a PokerSchool ticket (the ticket name is School Pass - see promos in Pokestars PokerSchool). After that you can use the ticket to register in one of the sats (there are 2 for day at 18:00 and 23:00 WET) and if you stay in the first 10 places you will win a ticket to a Freeroll where the first 5 places gets the Sunday Million ticket.