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If you return to the forum homepage and you are
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In Internet Explorer 6 on Windows XP:

Click the "Tools" menu.
Select "Internet Options" from the menu that appears.
Click "Delete Cookies" on the dialog box that appears. It will be in the centre area of the "General" tab.

In Mozilla Firefox:

Click the "Tools" menu.
Select "Options" from the menu that appears.
From the dialog box, select "Privacy" on the left.
Find "Cookies" on the main pane, and click the "Clear" button adjacent to it.

Your cookies should now be removed. You may want to restart the computer and revisit the forums to be sure.