Settings/Configure
Select the block, you will see the settings option in the right sidebar. You can see there are 2 tabs for configuration: General and Style.
General Tab

Config
You can input the API key and audience ID.

Elements
The options to show or hide the label, description, first name, and last name are available.

Button
This option allows you to change the button text.

Message
You can customize the text for success messages and error messages.

Placeholder Text
You can modify the placeholder text for the first name, last name, and email fields.

Forms
From here, you can select the desired form for customization.

Style
Form
You can customize the form’s background color, border, and padding.

Label
You can change the typography and color of the labels.

Description
You can change the typography and color of the description.

Input
You can change the typography, color, border, and padding of the inputs.

Button
You can change the typography, colors, hover colors, border, and padding of the button.

Messages
You can change the color and typography of the success and error messages.
