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I want to make a countDOWN timer...could someone please show me how to do this

You cloud create a text actor and in it's create actor script put:
textNumber = 30;
and add a createtimer event for every 1000 ms (which would be 1 second)
then in the timer event for that timer put:
textNumber -= 1;

and in the text actor's draw actor event put:
if(textNumber == 00)
{
insert what you want to happen here;
}

Also, follow the forum rules and avoid using subject titles like "need help!" and such so people searching the forum can tell what each topic is about without having to click on it.

Create an integer Variable called "count" and set it to how many seconds you want the player to have. Example:

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count=100;

Then, on a Create Actor event for an actor, select "Create Timer." Assuming you want your timer to count down in seconds, make "Time (ms)" 1000, and set "Repeat" to "Specify Quantity" and have "Count" to 1. Now, on a "Timer" event for the actor, select your timer and then in Script Editor type:

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count-=1;

Now on a Draw Actor event for an actor, type in Script Editor:

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if(count<=0)
{
    //your actions here...
}

If you would like to have the player see how many seconds they have left, create a text actor and in Draw Actor event for this actor, type in Script Editor:

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text_actor.textNumber=count;

EDIT: d-soldier beat me.

I beat you sure, but I think your way is probably better.

okay i will keep the rules in mind...and thank you for the help

d-soldier I am making a game where you have a score and a timer countdown. You have to push the right arrow key as many times as you can before the timer goes to zero. I followed your instructions and it worked.I set the timer for 15 sec, I want the key down(the right key ) to be disabled when the timer reaches zero, but you can still push the right arrow key to get more points. Can you tell me how to disable the ability to push the right arrow key (get more points).

this was posted like a year ago and i dont thing dsd gets online here anymore.

yeah I know

simple way: multiplier.
Multiplier is a very simple way to enable/disable without using a lot of code. Create another variable, and use it on your scoring. You don't need to use count variable in that manner either. All you need is the timer.

Like this

KeyDown>KeyRight

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Score+=value*enable;

That sure was simple, eh?

So score is your score variable, the one that your text actor will display. Value is how many points the player scores each time he hits the right key. and enable is a variable that's either 1 or 0. You set it to 1 whenever you want the player to be able to use keydown>keyright.

And on the timer

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enable=0;

Technically the player can still push right, and get a score, but the points are worth 0.

Of course if you have other actions on key right, and you want to disable them all, then you can still use if (enable>0){};

Same effect.

But the nice thing about the multiplier is you can use it for bonuses. Like if a player gets 10 in a row, points suddenly are worth double.