It's easy to make a post!
First, make sure you are logged in. TestMagic does not allow anonymous or "guest" posts, so you will need to
register and activate your account before you can post. (If you get stuck on that step, I have a post that explains
how to activate your registration (Can't post? Can't send a PM? Can't reply? Can't subscribe? Can't download?).)
I know it can be confusing to try to figure out how to make your very first post, but once you make just one post, it’ll be easy, don’t worry.
First, you need to go to the forum that you want to make a post in. Just go to the
main forum index (the "front page" of the forums) and look for the forum you want to post in. For example, you may want to go to the
introductions forum to say "hi." Or, if you want to get started raising your tests scores right away, you may want to ask a question about GMAT math. In this case, just go to the
GMAT math forum. When you get to that forum, you should see a button like this at the upper left, right above the titles of the posts:
If you don’t see a button, then you are not quite yet where you need to be. For example, if you're reading a post, and you want to make a new post, you won't see the "new thread" button. Instead, you will see only a "post reply" button:

(The forum software is designed this way so that people don't mistakenly make a new post when they mean to reply.)
Also, if you simply go to the
GMAT forum, you can’t make a post there, since that “forum” isn’t really a forum--it's simply a link to show you all the GMAT “sub-forums.” From there, you would have to click on the other links to make your post; for example, on a link that looks like this:
GMAT Data Sufficiency
Just click on that link, and you'll be in a forum where you can make a post about GMAT data sufficiency.
Of course, you can make posts in the other forums, not just the
GMAT forums. If you want to ask a question about TOEFL grammar, just go to the
TOEFL structure forum. If you want to ask about financial aid, just go to the
Financial Aid and Scholarships forum.
Finally, you should see the posting screen. However, if you're not logged in, and you click that button, you'll see a screen that you can log in from. From there, just type in your message. When you're done, click the button that says "Submit New Thread."
Of course, there are many, many other nifty functions that you will learn about while you are a member here. For example, you will be notified immediately when someone responds to your thread, you can send somebody a personal message through the
PM system, you can post a poll for people to vote in, and much, much more.