How to remove unwanted scheduled programs you can't delete

I checked out the college football season weeks ago and scheduled a game for my favorite team by a manual rercording because it was too early for it to be listed in the program guide.  I wanted to make sure I didn't miss it.  As the date got closer, the game became available in the Program Guide so I decided to delete the manual recording and schedule it via the Program Guide.  It seemed like a good idea at the time.  When I tried to delete the manual recording, I got an error.  I should remember the exact wording since I saw it so many times.  I tried a number of things and wound up with five "Untitled" scheduled programs I couldn't delete, but were using up available recording slots.  I was getting frustrated at this point.  Then it occurred to me to just change the recording time to a couple of minutes from now.  Each of the "Untitled" programs began recording right on schedule and I deleted them from Recorded Programs.  Going forward, I'm just going to wait and schedule from the Program Guide.