Avoiding session timeout
When you log in, checking the Stay logged in checkbox will prevent your session from being timed out after 15 minutes of inactivity. If you are on a shared or public computer, either leave the checkbox unchecked or be sure to log out of MacRumors before anyone else uses the computer.
Finding the posts you want
Click New Posts at the top of a forum page to see the latest new threads and posts. Click Spy for a page that's updated automatically with new posts as they are added.
Click Watched Threads or Watched Posts to have the forum system keep track of what you haven't yet seen in specific forums or thread. See How do I watch a forum or thread or user? for details. You can also watch for posts by specific users.
Click History for a list of the last 50 threads you have visited.
Email and alerts
Set the "Automatically watch threads that you create or when you reply..." and "receive email notifications of replies" options the way you want them in your Browsing Preferences.
Set the "Receive an alert when" options the way you want them in your Alert Preferences.
Forum system reference information
Use of the forums is free, but you can upgrade to Contributor status to support MacRumors. You'll receive a few thank-you benefits, including ad-free browsing, access to private forums, and a special user title.