Separate names with a comma.
Never mind, I figured it out myself. yum install kde-desktop, log out, log in to kde.
Oh, yea, by the way, I did try all the steps listed in the url
Parallels 11.0.2 CentOS Linux Guest cat /etc/redhat-release shows CentOS Linux release 7.1.1503 (Core) all current patches applied to CentOS and...