Can't authorize account – page not found on rollybueno.com

Hi! I’ve tried everything I’ve found on the forums but can’t get the Authorization message to go away:

– uninstall and reinstall plugin (many times)
– when I ‘activate’ – says it’s authorized on Instagram; but still have the “Simply Instagram has not been setup correctly. Kindly authorize Simply Instagram.”
– each time I go through the process I still end up at the ” Not Found / The page you’re looking for doesn’t exist. Try the menu. ” page.
– I’ve tried this multiple times for a few days now….

Can someone please help me?! I’d really love to get this working as there are no other plugins that offer this nice function for a widget that look as nice..

thank you!

http://wordpress.org/extend/plugins/simply-instagram/