synaptic manager problem :adding third-party repositories

[anthonyleamy]

I have been personalizing the ubuntu mini install on my netbook and am trying to add the crunchbang repository.
However, after adding the relevant http:// address in the APT line box, the +add source button remains greyed out and inactive; thus I cannot save the new source.

Tips for GUI or command line would be appreciated.

[oldos2er]

Lines in sources.list must begin with either deb or deb-src.

[anthonyleamy]

Thanks.
I just discovered that fact using the sudo cat /etc/apt/sources.list command

The'deb' doesn't appear in synaptic api line, hence the greyed out box.

Thank you for your help.