Adding repositories to Debian?

Hey.. How do you add the testing / unstable repositories?

On a possibly different note, I'm trying to apt-get qtparted so I can fix my small partition. But it wont show up. Is this because its testing / unstable? If thats the case I'm sure adding those strings can fix the problem. If not.. any idea?

If you want to search for any form of parted (there are several programs), use apt-cache search parted

As for addintg different repositories: edit /etc/apt/sources.list