Payment Form, Field Settings, Field Type: message

I am trying to use the 'message' field.  I assume that the message text to be displayed is entered into the 'Default Values' field.  Under certain conditions (defined with 'Depends On') I want the form to display a message that indicates that 'the choice is unavailable.'  When I set the form up this way and view the result on the web page, nothing is displayed. 
At the moment the issue can be seen here: josephz14.sg-host.com/index.php/register.../cardio-intermediate when selecting a choice OTHER THAN Class Length "5 Weeks".
-Joe
 

Hi Joe

Please enter the message you want to display into Description setting of the field

Then the message will be displayed

Regards,

Tuan