If someone broke into your account and changed your password, you can still usually reclaim control of your journal. You need access to an e-mail account that you had previously validated for your InsaneJournal account.
If your e-mail address has also been broken into, you will have to solve that problem before dealing with getting your stolen InsaneJournal account back. Security of users' own e-mail accounts is beyond InsaneJournal's responsibility and ability, and you may wish to talk to whoever is hosting your e-mail account.
Your InsaneJournal account's security is based upon your e-mail account's security. If you believe that your e-mail account is secure, but are not positive, you should always change your e-mail account password before changing your InsaneJournal password.
If someone broke into your account, first go to http://www.insanejournal.com/tools/emailmanage.bml and check whether there are any unfamiliar -email addresses there. If your e-mail address hasn't been changed, first immediately change your e-mail account password, and then your InsaneJournal password. Your account is now as secure as you can make it.
If someone broke into your account and changed your e-mail address, change your e-mail account password and then change the e-mail on your InsaneJournal account to the one you had previously used to validate with. Re-validate your e-mail address, and then visit http://www.insanejournal.com/tools/emailmanage.bml to remove the intruder's address from your account's status history. NOTE: You will need to re-validate an older e-mail address before you can delete a more recent address, so in order to get rid of the intruder's e-mail address, you'll need to re-validate your own old e-mail address - not a new one.
Assuming you have access to your e-mail account and it is secure, follow these steps to reclaim your journal:
If proper precautions are taken, your account security will never be compromised in the first place. Users are responsible for the security of their own accounts. Preventing any journal break-ins is by far the BEST way to ensure your InsaneJournal remains secure.