Hello Libra
it should change when you use the drop down mood meter in the top right under your PM notification box
which theme are you using? I just tested it on all of them and it worked fine for me, but would recommend that you switch to the forum default theme, and then go the main index page for NT and try again (the theme drop down choice is bottom left of the page...best changed again when on the main NT index
http://neurotalk.psychcentral.com/index.php )
let us know if you still have a problem