You know, you should try the help people give you, especially when they are the developers of the program you are using.
Just read this, as Ashley suggested.
A really cool feature in Construct 2 is timescaling. This allows you to change the rate time passes at in the game, also known as the time scale. You can set the time scale with the system Set Time Scale action. A time scale of 1 means normal speed. 0.5 means half as fast, and 2.0 means twice as fast. If you set your game's time scale to 0.1, it's going ten times slower but still smoothly - a nice slow-motion effect!
Timescaling works by changing the value returned by dt. This means behaviors are affected, and any movement using dt. If you don't use dt in your movement calculations (like the first event above) the motion is not affected by the time scale! So to use time scaling, you simply have to use dt properly in all movement.
You can set the time scale to 0. This stops all motion. It's an easy way to pause the game. Set it back to 1 and the game will resume.