Check who is your opponent in the Brackets (first stage: [You must login to view link], second stage: [You must login to view link]). Then, if your opponent has not created a topic yet, you can create a topic in the Scheduling Forums named for example "[AoFE-FF R1] Player1 vs Player2" and begin scheduling. Some scheduling tips are explained [You must login to view link].

Once you and your opponent confirmed a time to play, the maximum waiting time is 30 minutes. More than that, the player that came and is waiting must take a screenshot showing [You must login to view link] (so the current time is clearly visible) and Tournament lobby Game Room, and post the screenshot in Admin Win Requests topic, with a link to the post in the Scheduling forums where the game time was arranged and confirmed.

what are the deadlines for each round?

Round 1: 29th December 23:59 GMT
Round 2: 5th January 23:59 GMT
12th January 23:59 GMT
19th January 23:59 GMT
26th January 23:59 GMT
2nd February 23:59 GMT
9th February 23:59 GMT
16th February 23:59 GMT
23rd February 23:59 GMT

etc (all Sundays)