Its relatively easy to use this message board
However, its worth explaining how the board works and what does what. How the forum is laid out:
Firstly, on the main page, you have one category containing 5 boards and the rules.

Each one of these boards contains threads
In each thread there is posts
This makes the forum fairly easy to navigate.

However if you are looking for a specific topic or poster, you can use the search button at the top of the page. This function is very useful and allows you to use a simple or advanced search.

How to post:
When you enter a forum, there are numerous threads within it.
In order to post in these threads, click the topic title.
This will display the first 10 posts in that particular thread
If the thread has more than one page, clicking the topic title will take you to page number one, you can use the numbers to navigate to page 2, page 3 etc.
If you want to reply to a topic, simple find the "Add Post/Reply" button at the bottom of the thread.

This will take you to a post editor of sorts, and here you can type your message, add emoticons, bold text etc.

When you have finished your post, simply press the "Post Reply" button underneath the text area.

The same method applies to adding a new topic. However when doing this you must add a Topic title (This will be displayed in the forum for everybody to see.) and description. People can then reply to your topic.
Adding a poll follows the creation of a topic, however, if you scroll down, you will see there is a poll options box and a poll question box. This allows you to create a poll for all registered users to vote in. This is a handy feature if you're trying to rate something or find out the opinion of the community. Adding the question operates in a similar manner to adding a topic title, only it would be a poll question.
To add options to your poll, type each answer in followed by a return (Or all your options will be on one line and the poll won't work properly). Note: There is a limit of ten options per poll.
Then click post new poll to add it to the forum.