Here's an easy step-by-step:
1. Go to the EDIT slot of the program you want to save.
2. Press and hold L or R.
3. Press the SAVE button on the top of the touch screen.
4. Give your program a name and press OK.
5. Press OK/YES on the remaining dialogs.
That's it!
Also, how come you knew about the typo but didn't correct it? You can edit the title before posting the discussion, after all.
2そうだね プレイ済み