HP 50 g newbie questions

[srfkykr]

I'm a long time HP 11c user. I now need graphing capabilities so I picked-up an HP 50g and need coaching on how to use it. Yes I have accessed youtube.
1. On my home screen, the third item on the menu is "stack" and "sto" is missing. Why is it that way? The manual shows "rcl" in third position and "sto" in fourth position. How do I change it back to "sto" or the original default setting?
2. Since I am on "sto-rcl," does the HP 50g have similar functionality of "sto" - "rcl" as the HP 11c? If so, how do I access this functionality?
Thank-you for the help...willy