How to Edit Contact Forms
Using the baby goats page for an example, to edit the form, go to the theme customizer
Look for the Contact Form Section

Form block settings:

Title = The label that shows above the field
Form type = The type of the field you want. A text field, dropdown with options, or a text area block
Half Length = When checked, the field goes to half the length. When not checked, the field will display longer
Dropdown options = This is where you enter the options that you want to display in the dropdown field for the user to select
To add a new field, just click the ADD BLOCK button\