Using the Open/Save As dialog box, locate and select the picture you want to use. In the “Picture Password” window, click the “Choose Picture” button. Windows will ask you to verify that you’re the owner of the account by entering your password. On the “Accounts” page, select the “Sign-in options” tab on the left and then, on the right, click the “Add” button in the “Picture Password” section. Just hit Windows+I to bring up the Settings window and then click “Accounts.”
Setting up a picture password is pretty straightforward. In the right light at the right angle, someone might be able to decode your gestures-but a quick wipe of the screen after drawing your password should alleviate this. Keep in mind, though, that tapping and drawing gestures on screen leaves behind oils and other smears.