There is a separate program used for checking to see if there are replies to a message. From here you can read the replies, delete them if you wish, and even delete your original message.
The 'check replies' script is located in your Personals/Classifieds directory, as check_replies.cgi (UNIX) or check_replies.pl (NT).
For example:
http://www.mydomain.com/cgi-bin/ads/check_replies.cgi
http://www.mydomain.com/scripts/ads/check_replies.pl
However, you can check replies merely by clicking on the "check replies" button on the main personals or classifieds index page. When you access the 'check_replies.cgi' script this way, you'll be prompted to enter the user name and password you chose when you posted the original message.
Once you've done that, a page will come up that shows your original message, and a list of replies to that message. Next to each reply there are two buttons, "view" and "erase". Clicking on the "view" button will allow you to read the full message, and clicking on "erase" will delete the message entirely. There is also an "erase" button next to your original message, which -- when clicked -- will delete your message and all of the replies to it.