8000ft

When I "save location" from the "where am I screen" the position is saved in geo cord format and when I go to the "change name" option I am unable to change the name. I have to write down the geo cord #s , then delete the entry and re-input it manualy so that I cane give the location a name rather than just a geo#.
I have looked in the nav manual and there doesn't seem to be any instructions.
Any ideas?