well you managed to make a new thread {new post= same thing} just fine.

If you are reading a thread or post and want to reply there is a "reply" button above and below on the left side.

there's also quick reply and quote buttons in the lower right of each post.

the stuff at the bottom just means if you are logged in or not- what you can or can't do.

In the blue bar up towards the top on all the pages is User CP {user control panel}
that's where you can go to change your personal info, settings, how the forums are displayed on your computer, add a avatar ect.

Feel free to just try and explore= you won't break anything.

If you have any other or specific questions there is a computer forum near the top on the main page.
plenty of help there

here's the link for it
http://forums.braintalk2.org/forumdisplay.php?f=36