I have Nero6 & Nero7 and I just installed this for Nero7 but the process is the same for Nero6.
For Nero 6 or 7 the only you need loaded is the LightScribe API/Driver (assuming you have Nero version that supports LS, which you do).
You can find at either of these 2 places and it is exactly the same:
At Nero Nero LightScribe
OR here in the download section LightScribe
Once I loaded this, Nero Cover Designer automatically showed a LightScribe template option. However I found the Cover Designer very confusing to use and I downloaded the free SureThing 4 SE application from the LightScribe link above and it is easier to use. It installed and found CD inform track information from the internet and pasted it into the label I burned on the disc. Very nice.
It think zebadee provided the 4 Sure link above as well.