1. Set up the resource and widget.
2. On the widget page, go to the widget tab and click 'COPY THE WIDGE CODE TO THE CLIPBOARD'.
3. Open your site on Drupal and enter editing mode. Then open the page,
on which you want to place the widget, and go to edit it.
4. Change the text format of the content to 'Full HTML'.
5. Now click 'Source' and in the source code of the page in the right place (for example, at the very end) paste the previously copied widget code.
6. Save the page and as a result, the widget of the reservation will be displayed at the place of the inserted code.