From QuakeWorld Wiki
Official website (now dead)
 How to use a Qizmo (Quickstart)
- Start QuakeWorld
/connect <ip to qizmo>in the console and press enter (now you should be connected to the Qizmo).
.connect <ip to server>to connect via current Qizmo the the given server ip.*
* With the command cl_useproxy set to 1, there is no need to use the .connect command as the regular /connect command will work just fine (will only work in ezQuake).
Using the Qizmo menu
.menu bind stdto get the default bindings. After you enter this you can navigate through the different Qizmo menus.
 Default Qizmo Bindings
 Qizmo Lag fix features
 Color Forcing
Now you have red enemyskin and white teamskin. You can change these colours by changing the values of "Z" in the X/"Z" setting. To get QizmoColours(C) really working the next step is to set our team- and enemyskins.
Type "enemyskin qizmo" and "teamskin qizmo" Then turn off colorforcing by typing "teamcolor off" and "enemycolor off". You've to write "off" there, the usual "" is not enough.
You need special kind of skins installed in your Quake dir, you can try this one
The first ID colour is white (as the ID is set like 1,2,3,4,5..a.s.o as people connect to a server) so the colours still work if you're all white. Invite a friend to test these with you so you'll notice the difference (second ID-colour is brown).