The form title is usually in the Heading 2 property:
Click Themes then Visual Editor.
Select the Heading option from the menu on the left.
Select Body from the dropdown towards the left.
Select Heading 2 from the dropdown box towards the right.
Customize Heading 2 as per your requirement.
Note: All headings using the Heading 2 property will reflect the changes when customized in the visual editor.
ii. To customize the field name text within the form:
Click Themes then Visual Editor.
Select Section from the menu on the left.
Select Body from the dropdown towards the left.
Select Font, Size and Color from the dropdown box towards the right.
Click Save and Close in the top right corner.