I have had more than one person ask if it's possible for them to post their messages using more than one font color, for emphasis etc. Can this be done???
I assume that this is a mis post for a Bravenet service query, if not you need to check with your forum supplier.
If they can't do it in your Bravenet forum it is because you have explicitly switched the function off. Log in to your account, go to the forum page, click on General Settings, click on the Features tab and enable BB code and HTML.