If you are using the CharcoalGray99 web interface, you can edit the pages just like you would edit any other web page (i.e., modify the files on your local hard disk, then FTP them to the player when the edits are done).

If you don't know how to edit HTML code, then you should bone up on your HTML coding. There are books available on the topic...

But it sounds like what you really want is to block other people from reaching your empeg across the network. In that case, just password-protect it. That's a feature of Hijack if I recall correctly. Look in the Hijack FAQ and see how it's done.