Melvine ~ Your room steward will move it for you, just make sure that to be on the safe side the last day of your cruise you let BOTH your room steward and the pursers desk know that you will be staying on, just in a different cabin. The purser will let you know what time to meet down in the lobby the next day to be escorted off through customs and then escorted back on the ship and given your new S&S card.
Have fun!