alright, lets try this
Open the admincp, go to:
Languages and Phrases > Phrase Manager > Search Phrases
search for this phrase variable only
Code:
no_posts_in_this_forum
Now, once it pulls it up, click edit and replace it all with this code. (The translation box which in turn will overwrite the default coding).
Code:
There are no posts in this forum. <br /><br />
<a href="http://www.yourdomain.com/community/subscriptions.php">Text for subscriptions here.</a>
Replace the url and text for the ad with the correct info.
Regards!
Jonathan