how do I enable the root user from the Directory Utility? How do I enable the root account?  I don't see any options related the system user.  Do I enter the server as "localhost"?





What do I select here?

System Software Overview:

  System Version:   OS X 10.10.2 (14C1510)
  Kernel Version:   Darwin 14.1.0
  Boot Volume:  Mac OSx
  Boot Mode:    Normal
  Computer Name:    A MacBook Pro
  User Name:    thufir (thufir)
  Secure Virtual Memory:    Enabled
  Time since boot:  1:03


Hardware Overview:

  Model Name:   MacBook Pro
  Model Identifier: MacBookPro9,1
  Processor Name:   Intel Core i7
  Processor Speed:  2.3 GHz
  Number of Processors: 1
  Total Number of Cores:    4
  L2 Cache (per Core):  256 KB
  L3 Cache: 6 MB
  Memory:   4 GB
  Boot ROM Version: MBP91.00D3.B08
  SMC Version (system): 2.1f175
  Serial Number (system):   C02HH5JQDV33
  Hardware UUID:    FBB1FF0A-6EAC-5423-9E8F-405B181EF5F3
  Sudden Motion Sensor:
  State:    Enabled
You don't need to put anything in there if you're working locally, just click 'Open Directory Utility' [which you did, based on your second pic]

Then…
Edit menu - Enable root user [only available once you unlock Directory Utility, which it looks like you did]

...I would wonder why you need root unlocked - you really don't need it in OS X, you can sudo anyway