Unlike the other unhelpful friends, I will help.
First, place an elevator brick. There are 4x4, 8x8, and 16x16 sizes found in the Special catagory of the brick catolog.
Next, after it's spawned, wrench it. Name the brick "Elevator".
Ok? Next, make a button brick (I dont care what it looks like, you can use JVS, or a 1x1.)
Then, where do you want the elevator to go to?
Up a Certain Amount:
If you want the elevator to rise 5 bricks, you would enter this into the button:
OnActivate < NamedBrick[Elevator] < ElevatorMove [15]
The reason we put 15 is because it counts it in plates. 3 would be one brick, 9 for 3 bricks etc.
Up to a certain height:[.b]
If you want it to go to a certain height, rather than just a certain amount, first, you need to place a namedbrick at the level you want the elevator to go to. Let's place a 1x1 flat brick inside an example building. Then, lets name it Level2.
Next, wrench the buttonbrick to say this:
OnActivate < NamedBrick[Elevator] < ElevatorGoToBrick[Level2]
You need to type in the brick's name EXACTLY how it is. If you entered a space for the bricks name, it automatically renames the space to a underscore.
Hope I helped!