NP-25

[Leviset]

Probably another of my stupid questions:-
Just started using my NP-25 in HP-25c mode
Manual says you can have 49 steps in any program but doesn’t say how/where to save separate software. There doesn’t seem to be a Label of any kind but it seems to suggest registers 0-9 are available to store programs in.
So having written my first program how do I Name/label it so I can then start a second program - does it just allocate programs as 0,1,2.....9?
If I can do that then how would I then load or run any individual program.