Um, in all the distros I have used you did this either in the distro's device config or in a console configurator. Look for an X configurator in your distro unless it is RedHat
(in which case try:
locate RedHat-Config
)

Or in Mandrake try Mandrake Control Center.

If you are in Slack, I do not know, sorry, but somthing might show with

locate XF
that has config or configurator in it that could help.

In Debian, they might still have Linuxconf (AKA linuxconf) still working.

Basicly, video settings are in X and not in desktop in Linux. The X configurers for console tend to start with X. If you have to use Linuxconf, it sometimes massively gumpfhs up networking, so if can write down the network basics first before you use it. Some distros link the linuxconf command to something not so obsolete, though.

Sicne I don't know what version of what distro, can't check to see what distro uses for distro-specific stuff for your version.

Ageek