To log into the forum, simply click the 'Login' link on the main menu.
This is the screen you see when you use the "Login" option of the main menu. It is also the first thing you will see in any forum that only members have access to. The login screen contains the following:
NOTE: When using a shared computer, it is recommended not to check the "Remember Me" option, unless you remember to log out when you've finished the session. Leaving an account logged in on a shared computer makes it vulnerable to use by someone other than yourself, which may or may not have malicious intent (such as changing the password or email address of your account).