You have changed your password via the secret question. So your account should be now locked.
If you are the real owner of that account and you have already posted a BTC address with that account, follow following instruction.
1. Create a signed message using the Bitcoin address you staked to prove your ownership of the locked account. Example:
-----BEGIN BITCOIN SIGNED MESSAGE-----
My account <account> has been locked. Please unlock it. The current date is <date>.
-----BEGIN SIGNATURE-----
<insert Bitcoin address here>
<insert signature here>
-----END BITCOIN SIGNED MESSAGE-----
2. Before sending the signed message to mods, verify it by yourself with
Brainwallet,
Blockexplorer etc.
3. Create temporal Bitcointalk account by using a different email address.
4. Send PM to theymos, Cyrus, hilariousandco including the above signed message and the link to the post where you staked your bitcoin address.