Flagged message

Posted by M.L. on Apr 23, 2009; 6:28am
URL: https://support.nabble.com/Flagged-message-tp2681261.html

What is a flagged message?      
I tried to click on the flag icon which said "click to flag this forum " to see what happened.
There is the red flag on the top right corner.
How can I change it to the grey one? What does a red flag mean?
Thanks!