Terrain>>Layers>>select unused layer>>open the texture browser and select a texture you want to use>>press 'new layer'>>type in a name for it such as grass1>>type 'myLevel' for the package>>press ok>>select the layer you just made>>select the 'painting option' then paint the layer on terrain>>use scaling function to scale it etc...
Repeat.....this is just from memory so it may be sketchy, if ur having probs 2moro just say and ill hav a look on the editor.
