To install the application on a Sharp OSA supported device, you will need to do the following;
Then make sure you save the form.
All other options can be left as they are, including the proxy setting. After you have saved the form, 'Umango' will appear in the table on the list of Extended Applications. At the MFP, you can now choose the Sharp OSA option and Umango will appear in the list. If there are no other extended applications installed, it will launch Umango.
Make sure to check for obvious network hurdles, such as firewalls or advanced proxies.
Link to this article http://umango.com/KB?article=63