Hi Shiny. Welcome to the forums (in behalf of Boris, who's busy with his morphing adventures right now)

I have the big eDGe but I assume the calendar app on it is the same as in the PE. Is this how you created the calendar entry - opened a calendar you created in basic mode, long pressed on a date until a journal page came on the reader side, wrote your calendar notes then saved the page? If so, when you open your calendar on the basic mode, you will see an icon (memo pad??) on the date, longpress on it, then a popup window will appear with "delete daily notes" option, press on it to delete your calendar entry.

If however, you used the menu button, then pressed "new event", then typed the needed information, to delete the entry, you have to go to advance mode (again by pressing the menu button), then set the calendar by day until you can see the entry you want to delete. Long press on the entry, a pop-up window will appear with options including "delete event", select it and click ok. The popup window also has the edit option, press on it and a window will open to allow you to edit the entry.

I hope this helped. If the others know of a more economical way of doing it, you can be sure they will post it.