Hi Sharon,
This is a really easy one to miss (or not when you're use to it).
On the right hand side of your editor screen, just below the box with the Time/Style/Background bits'n'pieces is all the flooring things (for want of a professional description). It starts off (ususally) with the light brown "Floor" tiles, clicking on the arrow to the right you move into Walls, then Water, Ice etc.
If you head left from the Floor screen you hit "Empty" & the next screen to the left is your "Fake Walls".
Glad you liked my first level - getting time is really hard though.
With you're newfound knowledge I'm expecting big things (or very close to it) from your first level! heh heh
Most importantly though just have heaps of fun - check out the suggestions box right down the bottom for some useful tips on editing/playtesting if you haven't seen it already.
Regards
Robbie
