problem configuring ati screen resolution

ok i went into konsole and typed in aticonfig and alot of options appear. but the main option i need to change is this:

Examples:
1. Setting up fglrx for the first time.
Single head : aticonfig --initial --input=/etc/X11/xorg.conf
Dual head : aticonfig --initial=dual-head --screen-layout=above
This command will generate a dual head configuration
file with the second screen located above the first
screen.
2. Setting up big desktop to horizontal and set overlay on secondary display.
aticonfig --dtop=horizontal --overlay-on=1
3. Setting up modes for primary display.
aticonfig --resolution=0,1600x1200,1280x1024,1024x768
4. Force primary CRT on and TV-out off.
aticonfig --force-monitor=crt1,notv
5. Change tv geometry
aticonfig --tv-geometry=85x90+10-10
This will set tv to 85% width (where 100% ==
overscan) 90% height and shift 10 pixels right of centre
and 10 pixels down of centre.

-now hears what i typed: resolution=1024x768
i then either get a segmentation error or it just doesn't do anything the next line just says alex@alex-desktop:~$

what do i have to type or do to make the resolution 1024x768?

What distribution is this?

Normally you set resolutions, and then restart X (ctrl+alt+backspace).

I'm not sure, but did you tell your distro to use the driver instead of the standard one?

first backup your xorg.conf file

cd /etc/X11/xorg.conf

cp xorg.conf xorg.conf.bak

Then the command you need to run

aticonfig --initial --input=/etc/X11/xorg.conf

then restart by typing init 6

EDIT
make sure you are root when doing this