If you have any problems after reading the above post just ask your cabin steward and they will put in a request for an electrician to come to your cabin and help you.
Don't be concerned about doing this. It's usually easy for my DH to hook up our Firestick but on a couple of RCI ships we've had to ask for help and were told that they do this all the time. We of course gave a thank you ($) to the crew member that came to help.