The next thing you may want to do is change the time and/or date. When KStars starts up, the time is set to your computer's system clock, and the KStars clock is running to keep up with the real time. If you want to stop the clock, select Stop Clock from the Time menu, or simply press the Pause icon in the toolbar. You can make the clock run slower or faster than normal using the time-step spinbox in the toolbar.
You can change to any time or date by selecting Set Time... from the Time menu, or by pressing the hourglass icon in the toolbar. The Set Time window uses a standard KDE Date Picker widget, coupled with three spinboxes for setting the hours, minutes and seconds. If you ever need to reset the clock back to the current time, just select Set Time to Now from the Time menu.