The forms on your website are created using WPForms. The following tutorials are provided by WPForms and are useful for editing or creating forms on your website.
Create a New Form or Edit Current Form
Edit Form Emails/Notifications
Understanding and Accessing Form Entries
To use the form you created, get the form's Shortcode from the WPForm's area. Copy the shortcode (including the brackets):
Then, go to the backend of the page you'd like the form added to and paste the shortcode in the content editor:
Press the blue "Update" button on the page and now your form is live on your website!
You can do the same with the Page Builder. Paste the shortcode into a module's content field. Here is a button module for an example: