u You need create a character on your account and after, select a option of world where u want play the tournament... then now u buy a ticket of 500 tibia coins... now u can enter and play for 2 hours for 7 days..
remember Remember of that worlds are pvp and u can death and loss much rank!
if u If you are lucky u you can get 10 rank and obtiened obtain mounts and things beautiful..