When prompted, enter the password for the new user who you specified on the command line ( user1 in this example). When prompted, enter the password for the primary FileVault-authorized user. The default is to create a standard user. When prompted, enter the primary FileVault-authorized user name - this is the user who you specified to manage FileVault 2 (in Assign an Active Directory user who is authorized to manage an encrypted disk). Click the lock icon to authenticate with your current password, then click the plus sign to add a new user account. Select the New Account type (described above) from the drop-down box. On the left, click the plus sign to add a new user. This is the way to go if they will be using the Mac regularly, like others in your household. Run the following command: sudo fdesetup add -usertoadd user1 Adding a new user on your Mac takes just a few clicks and is easy with the following steps.After you login to Mac again and go to Users & Groups, you can see the standard user has become admin account. Check the option and click OK to restart the computer when a message pops up.
HOW TO ADD ANOTHER USER IN MAC FOR MAC
To authorize FileVault 2 users by using Terminal commands