How do I create a simple form and use prefixes?

[groovybluedog]

Okay so I put {$threadfields_display} in to the postbit_first I created and it doesn't seem to want to appear at all - I am trying to get it to show inside the thread content itself. The individual field's key works fine, but not the {$threadfields_display}. Am I missing something or is this intentional behaviour? Tried this in the default theme without luck too.