Some questions about the Map editor (add a skybox/had new grass textures)

Hello !

I make this little thread for asking stuff about the map editor.

So, 2 questions :
1) I'd like to put a skybox :

So I steal the skybox from Utah, and I put the texture in the skybox thing :

Sky look Badass !

But after saving and restart the game, the skybox disappears :

:/ What I need to do for keep the Skybox in ?

the other question :

2) How import a grass texture ? Where I need to put there image for use them has grass ?





Thanks for your awnser

 

Oh ok, thanks you