The circuit you have used relies on a LOW PULSE
The switch must be open ALL THE TIME and when it is pushed, the uncharged capacitor puts a pulse on the pin of the 555. During this time the capacitor charges and the switch must be opened for the capacitor to discharge. When the cap is discharged, the switch can be pushed again and the circuit will operate.
This circuit has been presented as it will create a fixed HIGH on the output no matter how long the switch is pressed.
You will have to tell us exactly what you want to do, for us to supply the correct circuit.