Samsung GT-S7580 - Setting a Pin; Setting a Password

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