Welcome to the community 7!
Here is some discussion on uninstalling -
http://community.mydevices.com/t/how-to-uninstall-cayenne/229
And some info from www.raspberrypi.org on root privlidges.
SUDOERS
The default pi user on Raspbian is a sudoer. This gives the ability to run commands as root when preceded by sudo, and to switch to the root user with sudo su.
Again welcome,
Ian