Howto Get kde desktop to run ?

[Barry <bewhite@bigpond.net.au>]

Hello,
I installed debian 7.5 on this m/c but it could not install gnome 
apparently because of some video problem.
In stead it installed the desktop light facility apparently successfully..

I used synaptic to install the kde enviroment but I cannot find how to 
start it up.
Can someone advise on this please ?

Barry