In order to post a thread, navigate to where you want the thread to be. For the example, it will be the Player Introductions sub-forum.
Head over to the Player Introductions sub-forum;
Once you are there, you will be able to see a button that says "Post Thread", if it is not there, you do not have permission to post there. This could be because of the sub-forum's permissions or because you did not verify your E-Mail.
Once you click "Post Thread", you will be greeted to a screen on where you can input the Thread Title as well as the option to change the Thread type (Discussion or Poll).
You will be able to use a range of tools to decorate the text within your thread. You can see these tools just below the Thread Types.
After you have finished writing, you can then click the "Post Thread" button in order to post the thread.
Note: Each sub-forum has it's own rules, please make sure to check out the Forum Rules.