From TM Wiki

Award ManiaStars to other players by logging on to the sites below with your game login details.

TMO http://www.trackmania.com/
TMS http://www.trackmaniasunrise.com/
TMN http://www.trackmanianations.com/

Enter other players login name into the hall of fame and click add. You can only add 10 players to the Hall of Fame list. The star days are raising every day (with the number of the votes casted to you)
1 star - 100 star days
2 star - 400 star days

To do ...