Properties & Custom Properties:
To find the properties and custom properties display: Go to > Settings tab
Custom properties:
Custom properties are really powerful and can aid your marketing efforts massively.
To create a custom property, simply select the field type from the list.
Field types:
Single line of text
Email
Number
True/False
Date
List
Available in forms:
If you require the field to be available in your forms, simply turn it on. Note: You can hide the fields too, under the hidden field type in your form settings.