If you believe your account has been hacked, the most important step you can take to secure your account is to change the password immediately. You may want to change the security question as well later, but changing your password is the principal method of locking bad actors out of your account.
For more information, please refer to the following help articles.
- I Forgot My Password / My Account is Locked / I Am Unable To Sign In
- How Do I Reset My Password When I Am Signed Into the Website?
If you see any filings in your account that you know you did not submit yourself, notify the court about these filings immediately.