You can easily share your device with family and friends by creating a separate user for each person. Each person has their own space on the device for custom Home screens, accounts, apps, settings, and more. You must be the device owner to add users.
To add a new user, follow these steps:
1. Go to 
Settings > Device > Users
2. Touch Add User, then touch OK
If your with the New User
Touch ‘Set up now’ and you’ll be taken back to the lock screen. Select the new user, unlock the screen, and allow them to set up their Google Account and other details.
If the New User is not around
Touch ‘Not now’. A ‘New User’ will appear in the list. The next time you’re with the user, go back to the user list and select ‘New User’ or click the user image on the lock screen.
After a user is set up, when you go to the lock screen, you’ll see a second user profile picture or avatar in the status bar. To choose a user, touch the picture and unlock the screen. Each user can set their own screen lock.