It's pretty straight forward if you read the thread.
"Description

Toribash Ranking is based on a seasonal system.
There are three seasons per year, each 3 months long. Best players of each year's seasons will compete in Toribash World Championships for the title of the best player of the year.
At the end of each season, players who qualified for Silver Tier or higher receive unique prizes.
The higher you ranked during the season, the better prizes you'll receive - starting with mid-tier body colors and up to Elite Tier color packs with unique full body customization sets."