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Functions required:

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drupal_hook_form_alter()
why? To check to see if fields are or are not null (note that "drupal" will be replaced with a suggested module name for anyone who thinks that this should be modulated)
dropdown()
Preferred/chosen method, due to its being concise. For larger sites, it would probably be best to use some kind of auto-complete function
foreach()
This is used to fill the drop-down with options (the variable $option will be used)
submit()
To initiate actions which will fill the form in question with the user entries made herein

Greetings!
I am building a community website and I chose the Acquia Prosper as my theme.

Now what I would like to do is add an additional line of text under the "Submitted by (user), on (date)" line, in each post, which it will say "Message (user) now!". I am already using the privatemsg module for personal messages communication for the website's users.
Any ideas on how is that possible? I really like this theme and I don't want to have change to it now...

Cheers,
Mike