You use the 'upside down pyramid' graphic next to the rating, which drops down a menu. This 'pyramid' is supposed to look something like a dropdown handle, and fails miserably
Have to admit, I didn't know how to do that either
I use the 'forum tools' dropdown, but have always clicked the text itself - didn't even realise the pyramid was there!
EDIT: These pyramids could be invading our everyday lives, and we haven't even noticed it... I'm off to check for more now