Ok, sorry to be a pain, right, I will explain in full:
Say I opened up Particle Illusion SE.
I then choose my emitter “splashes blue-green”.
At frame “1” I place my emitter on the stage.
I then go to frame “70” which is the frame in which I want my emitter to stop. (not be visible)
How do I make my emitter stop on frame 70?
Thanks to all the contributors!