Moho10,
Open DCC (DreamboxControleCentre) and connect to your box,than, on the richt dropbox you see your pc content and in the left dropbox you see the VU content
open FTP commander/usr/enigma2/python/plugins/extensions/streamTV
and there you will see a map called "stream.xml" and in there you can add/remove stream adresses.
Good luck and don't make mistakes, 1 digit wrong and you have a "green screen" so take care and make back-up 1st.
V8