How to correctly use timer?

[Kingdaro]

I'm making a shooter that creates enemies at the top of the screen at random amounts of time. Problem is I don't know how to correctly use the timer event. I went to Add > Timer > Script Editor and typed in CreateActor("enemy", "enemy", "(none)", "(none)", rand(600), -300, false); The enemies aren't being created T.T

[jimmynewguy]

how long is your timer? if i'm not wrong i believe 1000 = 1 second

[Kingdaro]

It's random 10-1000 ms.