You can access the Charm bar by hovering the mouse over the bottom right corner where the clock is located and swiping up. Click 'Settings icon'>> click 'Change PC settings>> Click 'Users'. You will see details of your own account on the right, and you will see a plus-sign button at the bottom with the text 'Add a user'.
Click the link to view the image.Add a user
You can also refer to this video to add a user account: Add a user account
If you do not want to use the Windows Live ID to add another account, refer to this video to switch to a local account: Switch to a local account
Hope this helps.
Please reply if you have any further questions.
Thanks and Regards,
Can you have more than one user in Windows 8 as in WIndows 7? Is it easy to do?