If a cue is programmed to advance automatically, the next cue will play by itself. If all the cues in a Script are programmed this way, the entire Script will play automatically after you fire the first cue.
To scroll through a Script: Use the vertical scroll bar. You can also scroll by selecting a cue, then using the arrow keys on your keyboard. Page Up, Page Down, Home and End also work. Note that scrolling has no effect on the current cue (the one playing to the audience), though it may change the selected cue. This allows you to find and work with any cue in a Script without affecting what's playing to the audience.