Actuator config
For an actuator you'll find an extra box, "Actuator settings", above Advanced settings in the edit sensor window.
Above is an example of how to configure an Actuator to switch for 1 minute, 30 seconds on each button press.
Switch mode: Each button press in the tile switches the actuator between open and closed, depending on its previous state.
Time mode: The actuator stays open or closed for a set period, then switches back. The time is entered as hours:minutes:seconds. In the example above it's set to 1 minute and 30 seconds.
Admin
You have to be admin of the system to use and edit the config of an actuator