Why can I no longer hyperlink text on a page? Links stopped working April 9.

When I enter a URL to hyperlink text to a document or URL the info no longer appears in the link box on the right hand column.  And when I publish the page even though the text to be hyperlinked is underlined, clicking on it just produces an error.  This is the site:  http://www.cfuwauroranewmarket.com/

This is the page:  http://www.cfuwauroranewmarket.com/Writing-Contest-Archive.html