Found the answer to why I could not delete memory channels by following the directions in the manual....
Q: I tried to delete a memory channel according to the instructions on page 23 paragraph 6 but it does not work. Am I doing something wrong ?
A: No, there is a mistake here. You must actually press and HOLD the function button while pressing the MW key to delete the channel and have the M icon start flashing again. Simply pressing the function buttion will not work so you must press AND hold.