To uninstall the service manually, go to
and find the .conf file corresponding to the service you no longer wish to use. Go ahead and delete it.
Then go to /usr/bin. Do:
and you will find a start/stop script corresponding to your service. Go ahead and run that with the "stop" command, e.g.
Then you can delete the start/stop script.
Finally, you can go to your Device List at the portal and under "Settings" you will find a link to delete this entry.