In order to add a tab, you must have a "Facebook Fan Page" not a personal Facebook account. 

PLEASE NOTE an important update from Facebook (full article here):
The Page Tabs feature is only available to Pages with 2000 or more fans, or pages managed by whitelisted apps.
(Pages created prior to this rule taking effect appear to be exempt from this rule)

1 - Log in to the Private Office:

  1. Enter the URL
  2. Enter your username (the email address you used when signing up)
  3. Enter your password (which you chose during the sign-up process)
  4. Click Login

2 - From the Dashboard:

  1. Click the Listings tab
  2. Click "On Facebook"

3 - From the Facebook Tabs page:

  1. Click the "Login with Facebook and get started..." button

4 - In the Facebook login pop up:

  1. If you don't have an account, click to create one
  2. OR

  3. Enter your login email
  4. Enter your password
  5. Click sign in

5 - Once logged in:

  1. Click "+ New Facebook Tab"

6 - Choosing a tab:

  1. Select the Facebook page you want to add the tab to (The option is if you have multiple pages)
  2. Click next

7 - Naming your tab:

  1. Enter the name of the tab (TThis is the title users will see on Facebook)
  2. Choose whether you want people to :like" your page before they can see the content of not
  3. Click next

8 - Selecting the type of content:

  1. Choose on of the three options
  2. Click next

9 - Selecting your listings:

  1. Select a tab to change the type of listings available
  2. Select your listings
  3. Click next

10 - Changing the display Settings:

  1. Choose to hide the view tabs to force a specific type of listing display (Gallery, Expanded View, Short View, or Map)
  2. Select your listings display if different from your general settings
  3. Choose to preview how the listings will display
  4. Click next

11 - Additional information:

  1. Change, delete or add some content to show above the listings on the Facebook Tab

12 - Published!:

  1. Your published tab will display here