Read the user agreement, and agree or disagree. You can use your real name if you like, but you don't have to. You'll also need to pick a password. If you've picked a nickname or password that someone else is already using, you'll be asked to choose another. If you choose not to register, you can still browse the boards as a guest.
Registered users have advantages, however.
They can post messages and join in the conversation on the chat boards. Non-registered guests can read messages, but can't post their own. When you come to the first page of a message board you will see a list of topics on that board. If you would like to read a message , simply click on the title. Under the main topic, you will see the replies indented to show the flow of conversation.