Seems like that page was created using the plugin and a map was used in the form. In that case, you can remove the form assignment from the page. Goto edit that page in wp-admin and set WPUF From to None.
You don't have to change the shortcode. You've to goto the edit page of “Make an Announcement” page. On the “WPUF Form” meta box, set it to “–“, that way this page will not be associated with any form and the google map will not be shown. Alternatively, you can disable the “Custom Fields in post” option from plugin settings.