You can access the Message Board from two places. On the main tool bar, click on the "Forums" button, Forth from the left. You can also get to it from the Main Menu. Which is located on the left of the screen.
You have to have a login to post in the forums (or anywhere on this site). Simply click on "Create an Account" on the tool bar and follow the instructions. Once you have a login, Click on Create an Account and enter your login and password. Then visit the forum section and you will be able to post.
On the main forums page are several folders going down the screen with descriptions beside them. If the folders are red, then there are new posts in there you have not read yet. Simply click on any of the description of the forum, and you will see all the disscussions in that forum. On the top right corner is the "New Topic" button. Click on that to post a new topic. Or click on an existing topic to read it and post a reply.
Not a problem, just select your post...at the bottom of the post is an "edit" button. Only the person who made the post will have access to that edit button. Simple click on that button and you can repair before too many people read it.