I don't know how to make a sky

[eh]

what do you do after you make the box and put the texture on it.

[T101]

The skybox needs an Actor->Info->ZoneInfo->SkyZoneInfo actor, and you probably want to set the ambient brighthness for that.

Next, for every 'wall' in the actual level, turn on 'Fake backdrop'.

May I suggest you look at the Unrealed site on PU? It's got loads of tutorials (including on skyboxes)

[Crager]

Check here http://utu.unrealism.com/ued2help/unrealed2.help.html

or here http://www.planetunreal.com/unrealed/index.asp