Go to Facebook and report that it was hacked and ask them if it can be opened again or what you need to do to open the account. You may not be able to open the account as Facebook may delete it if they find it has been hacked.
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My facebook account has been hacked, help I can not get into it at all. It won't let me post. And there is 2 different people or 3 using my account. Kat Lees - Designs by Kat Lees
You can contact Facebook and, if you can prove you are the legal owner of the account, they might reset the password and allow you to access the account again. Otherwise, you probably need to just start a new account and do all you can to keep it safe.
Change your password
you really can't you need a password when you get a account.
If your Facebook profile gets hacked ask your 10 friends to report it. Once the reporting is done Facebook reviews the report and suspend the profile from their database.
messages come up from 'you' saying stuff that you know you didn't type.