Add a star icon next to your name on the results screen and online races by completing all the Grand Prix races with a specific rank. Unlock the listed star icon by performing the corresponding task:

STAR ICON - HOW TO UNLOCK
One star profile name - Earn a "One Star" rank in all Grand Prix races.
Two star profile name - Earn a "Two Star" rank in all Grand Prix races.
Three star profile name - Earn a "Three Star" rank in all Grand Prix races.