Many new forum members are not very familiar with phpBB software or forums such as this one. This information should help you get started.
The index of our forums (showing the sections you have access to) is here: index.php
If you want to start a new topic (also known as a thread) then click on one of those forum sections. Make sure you're in the appropriate forum section for your topic. Then click the New Topic button on the left to start your thread. Write the subject (title) and message. You can click Preview at the bottom of the page if you want to see how it will look. Once you're done, click Submit at the bottom of the page to post it (publish it).
A good place to start is by introducing youself with a New Topic in our "Introductions and Greetings!" forum section here:
You can also browse through the most recent topics that other people have started, here:
If you see a topic that you want to respond to, click on the Post Reply button on the left. Then write your message and click Submit at the bottom of the page.
That's pretty much all there is to it. If you have any questions, please ask for help.