To secure my account I dont know what to do
If your question is How to secure your bitcointalk account?,
1. Log in to the web with the correct address
https://bitcointalk.org
I suggest you bookmark it in your Browser.
Do not sign in to phishing sites, like this (similar to the original bitcointalk):
https://bitcointalk.org/
Be careful, at a glance looks almost the same.
2. Update antivirus on your computer.
3. Be careful of links sent to you either via email or advertising on the web. Do not be easy to believe, first check its credibility by looking for referrals to other sources about the sender of email or web advertising.
If your question is How to get bitcoin signature / sign message? ..
1. The full way refer to the following links:
How to sign a message?!
For more safety, I advise you to use Bitcoin Core or Electrum for Bitcoin Wallet Address and create a sign message there.
2. Then post signed message that you created earlier in:
Stake your Bitcoin address here
Ask for another member to quote your bitcoin address signed message.
3. To recovering hacked account or lost password, please refer to this link:
Recovering hacked accounts or accounts with lost passwords
May be useful.