Open Question: How to hide my other accounts on a website?

Hey, i play a online game which my brother also plays, we both don't want each others account on the "other nicks" part at the bottom... its not against rules to have multiple accounts as there is no money to be made from the game - its you play as one player (soccer/football) soccer.kiekko.tk Does anyone know how i can stop them seeing my otehr account..