How to set a password on your local
First, click on your menu and right click on the 'My Computer' icon and select 'Manage'
Next, find the account(s) you want to set a password on. You want to set a strong password for all accounts listed that are active. Right-click the account you wish to set a password for and select 'Select Password....'
A window should pop up asking you to enter a password and to confirm it:
Perform the above steps for every account you wish to set a password for.