how join dialout group?

Development Tools IDE 1.x
1

how join "dialout" group? my OS is opensuse 12.3.10, ARDUINO UNO R3.
I tried on terminal:

edilon@linux-hb1q:~> gpasswd -a edilon dialout
gpasswd : denied permission

2

sudo gpasswd -a edilon dialout

3

Maybe this will help some. Arduino Playground - OpenSUSE