Samsung GALAXY Grand Prime User Manual page 345

Use a Screen Unlock PIN
1. From the Screen lock type menu, tap PIN.
2. Enter a PIN, tap CONTINUE, re-enter your PIN, and tap OK to save the setting.
 The screen lock is set

If you fail to enter the correct PIN after five attempts, you will be prompted to wait for 30
seconds before you can try again.
Use a Screen Unlock Password
1. From the Screen lock type menu, tap Password.
Settings 336