How do I put this source in.

[Major.Mikey]

I run debian and want a certain pugin for flash. So I turn to google. Google 
shares with me : 
http://debian.logiclinux.com/debian/pool/contrib/f/flashplugin-nonfree/

So I think that I just need to add  that line to sources.list but that doesn't 
work. Before I added that line it was saying that it might  be an obsoleted 
file and other stuff like that. Now it iss saying that it can't read the 
file. What am I doing wrong?