Setting A Pin; Setting A Password - Samsung GT-I8190 User Manual

Basics
Setting a pattern
On the Applications screen, tap Settings → Lock screen → Screen lock → Pattern.
Draw a pattern by connecting four dots or more, and then draw the pattern again to verify it.
Set a backup unlock PIN to unlock the screen when you forget the pattern.

Setting a PIN

On the Applications screen, tap Settings → Lock screen → Screen lock → PIN.
Enter at least four numbers, and then enter the password again to verify it.

Setting a password

On the Applications screen, tap Settings → Lock screen → Screen lock → Password.
Enter at least four characters including numbers and symbols, and then enter the password
again to verify it.
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