When you select a single day on one of the calendars (done by clicking in the day), the appointments entered for that day will be displayed in a list below the calendar.  Clicking on an item in that list will in turn display the full description for that item in boxes below where the information may be edited.

   Once the information has been changed, just click the enter button and the new information will be reentered into the list.  You may also extend the selection of dates a particular event occupies.  Just use shift-click in the calendar to add or remove additional dates.  If you shift-click a selected date, it will be deselected.  Dragging through dates in the calendar also works.  Experiment.  An item may have as many dates associated with it in as many months as you like.

   There are scroll bars now, but they're buggy.  I will fix that soon. It should only core dump, or go into an infinite loop,  when you resize the window, and then only sometimes.