Run the following in a shell:
Code:
sudo bash
cat "deb http://http.us.debian.org/debian stable main contrib non-free" >> /etc/apt/sources.list
cat "deb http://security.debian.org stable/updates main contrib non-free" >> /etc/apt/sources.list
apt-get update
exit
Note: this will ask your for your user's password.
You can then install applications using:
Code:
sudo "apt-get install application"