Showing a sign-up form in your posts or pages is as easy as copy-pasting the following shortcode in your post editor.
Example: Show default form
The shortcode takes an optional id argument which controls which form you would like to show (since you can create multiple forms if you're using the Premium add-on).
Example: Showing form with ID 100
You can use the same shortcode multiple times to render the same from more than once. When viewing the post or page on your site, the sign-up form will be shown instead of the shortcode.