Warp Help.

I looked and I didn't see a thing on this thread explaining it, so I'm asking this to help me and everyone else who is just starting making levels. How do you make a warp that you press down on to activate? And while your at it, explain how to make a warp at all ^^;

EDIT: Ok, I figured it out on my own. Thanks anyway....

Warps don't work that way, you are thinking about shifts. Read the manual, the stickies, and watch Bass videos. After that you should know pretty much everything there is.
If you are having trouble finding them they are right here.