In order to use Elevator Blocks, you need to craft at least two of them. These Elevator blocks must be the same color in order to work with each other. You can place them 20 blocks apart (22 if you include the elevator blocks). They must line up vertically with each other. If they are not lined up with each other, they will not work. The elevator will not teleport you if the receiving elevator is blocked. This is to prevent suffocation.