At a guess you've got JavaScript disabled. Many aspects of the forum structure rely on JavaScript, including drop down menus and the functions of the posting box.
....
If the forum isn't on either list them I'm a little confused over what could be causing the problem. You may want to try switching to an alternative browser, such as
Flock,
Firefox or
Opera. This is probably advisable anyhow - Internet Explorer, particularly Internet Explorer 6, is a terrible browser when it comes to security, web standards compliance, customisability and overall level of features.
In Firefox or Flock, the instructions are much simpler, firstly select the "Tools" menu and then select "Content". Ensure the "Enable JavaScript" checkbox is checked. After you have done that, select Ok.

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