Samsung Galaxy S6 User Manual page 316

2. Tap Screen lock type > Password.
Note: For credential storage, you can also use Pattern, PIN, or Fingerprints screen lock types. See
Screen Lock.
3. Enter a new password (at least eight characters without any spaces) for the credential storage,
scroll down and confirm the password, and then tap OK.
4. Select your display option for notifications on the lock screen, and then tap Done.
 The password is set, allowing secure credential storage.
Settings 306