Salutations can only be modified on a user by user basis. This can be done in one of two ways:

Through the Contact Card:
  1. Navigate to Core > People Finder
  2. Search the name of the user you are looking to add a Salutation for
  3. Click on the Contact Card Tab on their profile
  4. Click on the Edit pencil icon for the Address Information
  5. Enter the desired salutations, for examples of what they might look like
Formal: Mr & Mrs Peter Whipple
Informal: Pete and Patricia Whipple
Household: The Whipple Family
Through the User Profile:
  1. Navigate to Core > Edit User Profile Data
  2. Search for the user you wish to modify
  3. Click on the user's name
  4. Under Address Field, click the Edit link for the current Address
  5. Enter the Salutation(s)
  6. Click Save & Exit