By default, most properties are automatically available in forms. However, if you created a custom property, it may not be set up to be available for use in forms. To check this:
- Navigate to Contacts > Contacts Settings.
- Find the property and click the name to make edits.
- Click to toggle the Use in forms? switch to YES.
- Click Save Changes.
This property will now be available in the Fields tab of the form editor.