The plugin currently provides three shortcodes:
So, for instance, to have a page (not a post) on your site which has a level annuity calculator, create a new page and put the shortcode [annuityCertain] in the text of the page.
By default the plugin will provide both a question with randomised parameters, and a form that just calculates the answer. If you want just the question form add the attribute answer=0. If you want just the answer form add the attribute question=0. E.g. [annuityCertain answer=0] would show just an annuity question form.
The shortcodes don't work in posts.