Can I change my Bitcoin address to withdraw??
I used Bitcoin address of Bter.com but now, the site is off and the wallet had been shutdown, so I cant withdraw anymore.
My account in level 4, please help me out

Possibly though support, but I doubt it. Once you post your address somewhere, or get a payment. Then people could simply login as you, contact support and get your account changed. PEOPLE SHOULD NOT WANT THIS TO HAPPEN.
How can I contact the support? I sent them 2 ticket, almost a weeks and got nothing