Hacker didn't change the password.
I already changed the password now to restrict access to hacker.
The two posts were on these pages-
1. http://archive.is/HDrWX
2. http://archive.is/YLeZ2
I have deleted those replies now.
Both of these posts were on these of some application SFCMachine.
I suspect 'Micio' is the hacker since he started both of these threads and replies posted from my account were promoting that thing.
Should I do anything else than changing the passwords?
You were lucky that your password haven't changed after the person gained access to your account. You must ensure that your new password would be strong enough for the scenario to not happen again. Also, try to check whether the email address attached is still yours. It could cause a lot of problems too
And here I am wondering, why does this forum don't send any email confirmation whenever the email or other aspects of the account is changed. In that way, the true owner of the account would at least have the final card if the hacker decides to replace the email.
The strangest thing here is that you won't even get notification when password is being changed.