Code: [Select]

rm -rf /opt/PlaneShift
rm -rf ~/.PlaneShift

That should pretty much do the trick unless it was installed somewhere other than /opt
To see the directory in your home directory you will likely have to view hidden files but the second line will delete it even if you do not see it.
There may also be scripts in /usr/bin/ that you should also delete it should be pretty obvious which ones they are. I do not have them on this box or I would be more specific, perhaps someone else will chime in.