new page error

I am reviewing the free Full Frame theme to see if it meets my needs. I created a new page ‘About Us’. I added it to a new menu I created. When viewing the website, it shows in the menu but when I click on it I receive the below error. There is text and image added to this new page.
404: Page not found
This error is generated when there was no web page with the name you specified at the web site.
Troubleshooting suggestions:
Ensure the page you are linking to exists in the correct folder.
Check your file name for case sensitivity . Index.htm is not the same as index.htm!
Temporarily disable any rewrite rules by renaming your .htaccess file if it exists.

The page I need help with: [log in to see the link]