Two ways this can by done.
On Property creation phase, add “New Property Details”, click save, and you will be presented with the “Add Property Options” where you can associate a user by “Link An Existing User” or “Invite New User” (Primary Contact, Alternate Contact or Tenant)
On the Property Listings page, click on the property number hyperlink. On the Property page, right side widget named “Associated Users”, click the right click on the plus sign to either add an existing user or invite a new person. Remember to click update before moving away from this page!