From the right edge of the screen, swipe left to display the charms menu.
Tap Change PC settings (located in the lower-right).
From the left-pane, tap Accounts. If not available, tap the left arrow icon (located in the upper-left) as necessary until 'PC settings' appears in the upper-left.
From the left-pane, tap Other accounts.
From the 'Manage other accounts' section, tap Add an account.
From the 'How will this person sign in?' screen, enter the Microsoft account email address and password (Outlook.com, Live.com, Hotmail.com or Msn.com) then tap Next (located in the lower-right). If you don't have a Microsoft account and wish to create one, tap Sign up for a new email address (located below the Email address field) then follow the on-screen instructions to complete the account setup. If you don't wish to sign in with or create a Microsoft account, refer to Sign in without a Microsoft account.
Tap Finish (located at the bottom). An active Internet connection is required to sign in to the new user account for the first time.