Note: If you want the extended data to appear in your results and it is not already there via the SLP style you are using, you may add to the Results layout the shortcode: [slp_location data.<slug>] where <slug> matches the field slug noted in the Extended Data Manager admin interface.
Adding Custom Fields
Go to the General / Data tab. Add a new custom field to your locations via the Add Extended Data Element group.
Managing Extended And Custom Fields
You can manage which fields are shown, hidden, their data types, and other attributes of extended location data element via the Manage Extended Data Elements group under the General / Data tab.