Shutter unReloaded

I tried to install a plug in called Shutter Reloaded. Supposed to give a customizable lightbox effect. Big disappointment.
You’re supposed to add rel=lightbox somewhere – but where?
Now I’m testing jQuery Lightbox. Similarly you’re supposed to add rel=”lightbox” to the picture somehow – but there’s no clue where this code is supposed to go. Have tried it in several places, without joy. Very frustrating.

Day 2
Seems I also have to add class=”shutter” somewhere as well. But for the life of me I can’t work out where.
I have tried and tried and I’m fed up with both these plug-ins
I thought plug-ins were supposed to make life easier!
🙁