How do I get an emitter to start at a different time than frame 1?
Slide the time indicator to the frame you want your emitter to begin at, click on the emitter’s name in the library window, and add it to the stage. It will now start at the chosen frame. If you already have an emitter on the stage and you want it to start at a different time, Cut the emitter (ctrl-X, cmd-X or Edit>Cut), move the time slider to the frame you want it to begin emitting at, and Paste it (ctrl-V, cmd-v or Edit>Paste).
