You can add Form Field Snippet Blocks to your Drag-drop or Contentbox Page - either by dragging the in to your page or using the Add Snippet Block button.
You can also add inline-form fields (not full Snippet Blocks) to existing Snippets clicking into the Snippet content and using the icons there.
The minimum fields required are NAME, EMAIL and SUBMIT.
Adding Form Fields to a standard page rather than using a dedicated Form/Enquiry Page is that you cannot customise the thank-you page, but you can still set a custom notification email via the OPTIONS tab.