Handling matrices on home screen hp prime

[halbitton]

Hi all, after a hiatus of several years, I'm back once again.
I've recently acquired an hp prime. While it's blazing fast and very powerful, I'm having a bit of difficulty with some of the user interface functionality on this beast...one instance being handling matrices in the HOME screen. I've discovered holding blue shift and double clicking 5 to compose a matrix right on the command line, which is nifty enough. After entering that matrix onto the stack, however, any editing I want to do on it is difficult. I know that selecting it and hitting enter puts it onto the command line in one line form for editing, which is very tedious. Is there not an easy way to put a matrix from the stack into a matrix writer and then back onto the stack? I've tried storing the matrix into one of the "matrix memories" (M0-M9), but the machine does not want to do this from the home screen. I can recall stuff from M0-M9 to the home screen, but not vice-versa. I keep thinking of my 50g's and 48gx's ease of handling, editing, storing and recalling matrices...perhaps this is my downfall. Any insight appreciated. Best regards, Hal