You can't. The only way is to send them a email or letter to the fanclub and hope they answer.
A lot of fans send gifts to Universal Records labelled for a specific member of the band. I'd imagine it say "Tokio Hotel Bill Kaulitz" or Tom or one of the Gs.
Bill Kaulitz
Bill Kaulitz,
Bill Kaulitz's birth name is Bill Kaulitz-Trmper.
No, Bill Kaulitz's name is Bill Kaulitz, not Wilhelm. 'Bill' is not short for anything.
Bill Kaulitz likes all of his fans.
Jörg Kaulitz.
Bill Kaulitz is right handed. As a matter of fact, they are all right handed.
No Jörg Kaulitz is.
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bill kaulitz does drive he drives a BMW 650i cabrilet