Here are the steps to set a password to your memo on the Samsung Galaxy S 2.
Your recorded memo is a personal thing and hence you would like to lock it up with a passcode. Once you have lock it, unauthorize user will not be able to view it.
To lock it:
1. Go back to the Home screen.
2. Then open the application list.
3. Next select Memo.
4. Now press Menu .
5. Select Search, and search for the desire memo.
6. Select the memo you would like to lock to view its detail.
7. Now press Menu .
8. Select More.
9. Choose Passcode lock.