In Windows 10 Os new feature make Picture Password of your account,
Select image and then select one arrow on anywhere in image it is your password.
So use this feature in Windows 10 follow the below simple steps,
First open desktop in Windows 10 os ,
Then click on start button and then click on setting button and click on setting menu as per below image,
Then go to Accounts ,
In accounts go to Sign-in Option and then go to Picture password,
Click on Add Image and then it display below image,
Choose any picture that you have to make on lock screen and then make arrow anywhere in picture three time see below image as example,
Do the same three time and then your Picture password set when it is done ,it display below screen to confirm it is done.