Chameleon Arch Pocket Watch

I received my fob-watch today, and it is every bit as beautiful as other clients have raved about. It took exactly 3 weeks from order to arrival.
As a nurse I am going to use mine at work, (which means I can claim it on tax- yeah!) and I am looking forward to seeing if any of the children recognise it from Dr. Who.
As a non-techy I would have liked a little explanation of
where the battery goes and how to set the arms.
All's well now though. Panic over.