Re: How we change the lock pattern
There's no 'Screen lock pattern' either on 8.1 or 10. However there is PIN you could set up and use. Go to Settings -> Personalization -> Lock screen -> scroll down and choose Sign-in options -> choose add, type your pin and you're all set. You will be using it to secure not only your phone but all other MS related services, so make sure you don't forget it.