Drag the "form" block on the "Page Builder".
Click "Select Form", a fly-in window comes out.
Choose the form you would like to display on the "Page"
Click Go Live to save your changes.
Hide / Show Label - Hide/Show the fields labels, if they are hidden your visitor will have to rely on the placeholder text for the input fields. NB: It is a good idea to show labels for larger or more complex form.