Are you using Shoutcast 1.9, Shoutcast 2.x or Icecast ?
Icecast and Shoutcast v2.x are pretty much the same:
To rename your stream, please take the following steps:
Step 1. Log into your Centova Panel, and click on "Settings"
Step 2. On the right hand side, click on "Mount Points" tab.
Step 3. Select /stream and then click on "AutoDJ Settings" tab
Step 4. In the box beside "Mount point name" enter in the name of the mount point you wish.
Step 5. Click on "Update" button at the bottom.
Step 6. Stop and restart your stream.