Here you can manage your custom fields.
You can manage custom fields from Manage > Custom Fields
Use the “Add Custom Field” button to add new fields. Simply drag and drop the fields to change the order of appearance when creating/editing element.
Your fields will automatically appear when creating/editing element.
Custom Fields Tokens
It’s easy to use your custom fields in themes by using the following token syntax:
[LiveContent:field_name]
It’s important to use the exact syntax above with the word name replaced by the actual name of the field. The name of the field must be in lowercase and any spaces must be replaced by an underscore. For example, token for a field name “First Name” would be [LiveContent:field_first_name]