Align post profile?

Classic Postbit.
You have to check the Classic Postbit option in your UserCP.
If you want to have everyone on Classic, check your configurations.

You should of googled it, or just checked the forums settings.

It's easy to do, as Silence mentioned.

its classic_postbit. you could make it default through setting

There's also this.
http://community.mybb.com/thread-40093.html

Haven't used it but I've seen it around a lot.